Introduction
- The Value of a Bond:
- A bond is a financial instrument that represents a loan made by an investor to a borrower (typically a corporation or government).
- The borrower agrees to pay back the principal amount (the face value of the bond) at a future date, known as the maturity date, and usually makes periodic interest payments (coupon payments) to the bondholder until then.
- Present Value of Cash Flows:
- The value of a bond can be calculated by discounting its future cash flows back to the present.
- This means that the amount of money the investor expects to receive in the future (both the coupon payments and the principal repayment) is adjusted to reflect its current value, considering factors such as the time value of money and the risk associated with those cash flows.
- Discount Factors:
- Discount factors are used to discount each future cash flow of the bond to its present value.
- These factors are derived from the appropriate periodic required return, which is the rate of return an investor demands for holding the bond, taking into account factors such as prevailing interest rates, credit risk, and the bond's maturity.
- Coupon Bonds:
- Coupon bonds are bonds that pay periodic interest payments (coupons) to the bondholder until maturity, at which point the principal is repaid.
- Discount factors are particularly important for pricing coupon bonds because they involve multiple future cash flows.
- Determining Fair Pricing:
- By calculating the present value of a bond's cash flows using appropriate discount factors, investors can determine whether a bond is trading at a fair price, known as "par value," or if it's trading at a discount (cheap) or premium (rich) relative to its intrinsic value.
- Law of One Price:
- This principle states that securities with identical future cash flows should sell for the same price.
- In other words, if two securities offer the same future returns, they should be priced equivalently in the market.
- Arbitrage Opportunity:
- If a mispricing occurs, where identical securities are priced differently, it creates an opportunity for riskless arbitrage.
- Investors can exploit this mispricing by buying the underpriced security and simultaneously selling the overpriced one, profiting from the price difference until market forces correct the discrepancy.
Bonds Vs Securities
- Bonds:
- Definition:
- Bonds are debt securities issued by governments, municipalities, or corporations to raise capital.
- When you buy a bond, you are essentially lending money to the issuer in exchange for periodic interest payments (coupons) and the return of the bond's face value (principal) at maturity.
- Characteristics:
- Issuer: Bonds can be issued by governments (e.g., Treasury bonds), municipalities (municipal bonds), or corporations (corporate bonds).
- Coupon Payments: Typically pay periodic interest (coupons) to bondholders, usually semi-annually or annually.
- Maturity: Bonds have a specified maturity date when the principal amount is repaid to the bondholder.
- Risk Profile: Bonds vary in risk depending on the issuer's creditworthiness. Government bonds are generally considered safer (e.g., U.S. Treasury bonds), while corporate bonds may carry higher risk depending on the issuer's financial health.
- Types of Bonds:
- Government Bonds: Issued by national governments (e.g., U.S. Treasury bonds, German Bunds).
- Municipal Bonds: Issued by local governments to fund public projects.
- Corporate Bonds: Issued by companies to finance operations or expansions.
- Purpose:
- Bonds are used to raise capital for long-term investments or to finance operations.
- Investors purchase bonds for steady income (from coupon payments) and preservation of capital.
- Securities:
- Definition:
- Securities are financial instruments that represent ownership (equity securities) or debt (debt securities) in an entity (e.g., company, government). Securities are generally tradable and can be bought and sold on financial markets.
- Types of Securities:
- Equity Securities:Represent ownership in a company, such as stocks (common or preferred shares). Investors in equity securities participate in the company's profits through dividends and capital gains.
- Debt Securities: Include bonds (as discussed) and other instruments like treasury bills (T-bills), notes, and commercial paper. Debt securities represent loans that investors make to issuers, with the expectation of repayment with interest.
- Marketability:
- Securities can be traded on organized exchanges (stock exchanges) or over-the-counter (OTC) markets. They provide liquidity to investors who wish to buy or sell them.
- Purpose:
- Securities serve various purposes for investors and issuers, including raising capital, managing risk, and providing investment opportunities with varying levels of risk and return.
- Key Differences:
- Nature:
- Bonds are a specific type of debt security, representing loans to issuers with fixed interest payments and maturity dates.
- Securities encompass a broader range, including both debt and equity instruments.
- Income Generation:
- Bonds provide fixed or floating interest income to bondholders.
- Whereas equity securities (like stocks) offer potential dividends and capital gains based on company performance.
- Risk Profile:
- Bonds generally have lower risk compared to stocks (equity securities), but their risk varies based on the issuer's creditworthiness.
- Securities, especially equity securities, can fluctuate in value based on market conditions and company performance.
- In essence, while bonds are a subset of securities focused on debt instruments with fixed terms, securities encompass a broader range of financial instruments including both debt and equity investments traded in financial markets.
Fundamentals of Bond Valuation
- If a bond is a good investment: By comparing the calculated value to the market price, you can see if it's undervalued (potentially offering a higher return) or overpriced.
- Expected return on a bond: Bond valuation helps estimate the yield to maturity (YTM), which is the internal rate of return an investor gets if they hold the bond until maturity and reinvest all coupon payments at a specific rate.
- This principle states that a dollar today is worth more than a dollar tomorrow.
- Bond valuation considers this by discounting future cash flows (coupon payments and face value) to their present value.
- Step 1: Future Cash Flows
- Estimate the cash flows over the life of the security.
- Face Value (Par Value): The amount repaid to the bondholder at maturity.
- Coupon Rate: The annual interest payment as a percentage of the face value. It's typically paid semi-annually.
- Maturity Date: The date the bond matures, and the face value is returned.
- Bonds typically promise two types of cash flows:
- periodic coupon payments
- repayment of the bond's face value at maturity / return of principal
- Step 2: Discounting Future Cash Flows
- Determine the appropriate discount rate based on the risk of (uncertainty about) the receipt of the estimated cash lows.
- The value of a bond is calculated by discounting its future cash flows back to the present using an appropriate discount rate.
- The discount rate reflects the required rate of return or the yield investors expect to earn from holding the bond.
- It accounts for factors such as prevailing interest rates, credit risk, and the bond's time to maturity.
- This is the rate used to discount future cash flows. It reflects the:
- Risk-free rate: The return on a risk-free investment (e.g., government bond).
- Risk premium: Additional return required to compensate for the risk of the bond compared to risk-free investments.
- A higher discount rate reduces the present value of the bond's cash flows, making the bond less valuable.
- Step 3: Present Value Calculation
- Calculate the present value of the estimated cash lows by multiplying the bond’s expected cash lows by the appropriate discount factors.
- The present value of each future cash flow is calculated separately and then summed to find the total present value of the bond.
- Formula
- Bond Price = (Coupon Payment / (1 + Discount Rate)^1) + (Coupon Payment / (1 + Discount Rate)^2) + ... + (Coupon Payment / (1 + Discount Rate)^n) + (Face Value / (1 + Discount Rate)^n)
- Where
- n = Number of periods until maturity
- Market Interest Rates:
- Bond prices and interest rates have an inverse relationship.
- When interest rates rise, existing bonds with lower coupons become less attractive, decreasing their price.
- Conversely, falling interest rates increase the value of existing bonds.
- Creditworthiness of Issuer:
- Bonds issued by governments (considered low risk) generally have lower discount rates than corporate bonds (higher risk).
- Liquidity:
- More liquid bonds (easier to buy and sell) tend to trade closer to their fair value.
- Risk-Free Rate for Treasuries:
- Treasury bonds are backed by the U.S. government, which is considered virtually risk-free because the government is unlikely to default on its debt obligations.
- The appropriate discount rate for valuing Treasury bonds is the risk-free rate itself.
- This rate can be derived from the yield of a Treasury security with a similar maturity to the bond being valued.
- Since there is minimal risk associated with Treasury bonds, a single discount rate, equal to the risk-free rate, is used to discount all the future cash flows of the bond, including coupon payments and face value at maturity.
- Eg: Suppose a Treasury bond with a face value of $1,000 is issued at $950. The discount rate would be ($1,000 - $950) / $1,000 = 5%. At maturity, the bondholder receives $1,000, resulting in a $50 gain.
- Non-Treasury Discount Rates:
- Non-Treasury securities, such as corporate bonds, carry additional risks compared to Treasuries.
- These bonds carry additional risks compared to Treasuries, such as:
- Credit Risk: The risk that the issuer might default on their debt obligation.
- Liquidity Risk: Difficulty buying or selling the bond quickly.
- Call Risk: The issuer's right to redeem the bond before maturity (at a premium), potentially affecting the investor's planned returns.
- Prepayment Risk: The possibility of the issuer repurchasing the bond before maturity (usually at a premium), impacting the expected cash flow stream.
- To compensate for these additional risks, investors demand a higher return on non-Treasury bonds.
- This additional return is called the risk premium.
- The appropriate discount rate for valuing non-Treasury securities is obtained by adding the risk premium to the risk-free rate.
- Single Discount Rate vs. Multiple Rates:
- There are two main approaches to incorporating the risk premium:
- Single Discount Rate:
- This method adds the risk premium to the risk-free rate to obtain a single discount rate.
- This rate is then used to discount all the cash flows of the non-Treasury bond.
- Eg:
- Suppose you are considering investing in a project that will yield cash flows over the next 5 years. The project requires an initial investment of $1,000, and you expect the following cash flows:
- Year 1: $300
- Year 2: $400
- Year 3: $500
- Year 4: $400
- Year 5: $300
- To evaluate whether this project is financially viable, you need to discount these future cash flows back to the present value (PV). Let's assume a single discount rate of 10% per year.
- Calculation: Discounting Cash Flows:
P V = 300/ ( 1 + 0.10 )^ 1 + 400/ ( 1 + 0.10 )^ 2 + 500/ ( 1 + 0.10 )^ 3 + 400/ ( 1 + 0.10 )^ 4 + 300/ ( 1 + 0.10 )^ 5 - Calculating each term:
- Year 1:
- Year 2:
- Year 3:
- Year 4:
- Year 5:
- Summing these present values gives the Net Present Value (NPV):
- Since the NPV (1438.81) is positive, this project would be considered financially viable at a 10% discount rate.
- Multiple Discount Rates:
- This method recognizes that risks might not be evenly distributed over time.
- Different discount rates are used for each cash flow, with higher rates applied to cash flows further in the future, reflecting potentially greater perceived risk as the maturity date approaches.
- Eg:
- In contrast, using multiple discount rates involves applying different rates to each period's cash flows based on their specific risks or time preferences. For instance:
- Year 1: Apply a discount rate of 8%
- Year 2: Apply a discount rate of 9%
- Year 3: Apply a discount rate of 10%
- Year 4: Apply a discount rate of 9%
- Year 5: Apply a discount rate of 8%
- Calculation: Discounting Cash Flows with Different Rates:
P V = 300/ ( 1 + 0.08 )^ 1 + 400/ ( 1 + 0.09 )^ 2 + 500/ ( 1 + 0.10 )^ 3 + 400/ ( 1 + 0.09 )^ 4 + 300/ ( 1 + 0.08 )^ 5 Calculating each term:
- Year 1:
- Year 2:
- Year 3:
- Year 4:
- Year 5:
- Summing these present values:
- NPV=277.78+336.67+375.94+308.82+204.32=1503.53
- The NPV (1503.53) is again positive, indicating that using multiple discount rates also shows this project as financially viable.
- The choice between these methods depends on factors such as the complexity of the bond and the investor's preference for risk assumptions.
- Single discount rates are simpler but assume constant risk, while multiple discount rates allow for varying risk levels over time.
- Understanding these differences in discount rates helps investors make more informed decisions when valuing and comparing different types of bonds in the market, taking into account their risk profiles and expected returns.
Price Yield Curve
Discount Rate and Bond Value:
- Imagine a bond that pays you a certain amount at regular intervals until it matures, with a final payment of the principal amount.
- The discount rate is basically the interest rate you use to calculate the present value of all these future cash flows (coupon payments and principal repayment) of the bond.
- A higher discount rate means you're using a less attractive interest rate, so the present value of those future cash flows goes down. This, in turn, makes the bond itself less valuable.
- Conversely, a lower discount rate makes the present value of the cash flows go up, making the bond more valuable.
- Let's take a look at how different discount rates affect bond valuation and who benefits in each scenario.
- Example:
- Consider a bond with the following features:
- Face value: $1,000
- Annual coupon payment: $50
- Maturity: 5 years
- We will calculate the present value of this bond under two different discount rates:
- Scenario 1: Lower Discount Rate (5%)
- Scenario 2: Higher Discount Rate (10%)
- Results:
- Discount Rate 5% = Present Value of the Bond $1,000.00
- Discount Rate 10% = Present Value of the Bond $810.46
- Who Benefits?
- Lower Discount Rate (5%)
- Advantage: Bond investors. In this scenario, the bond's present value is higher, meaning investors can potentially buy the bond at a premium or closer to its face value.
- Disadvantage: Bond issuers. They may have to offer a higher coupon rate to attract investors when interest rates are low.
- Higher Discount Rate (10%)
- Advantage: Bond issuers. The lower present value allows them to potentially issue the bond at a discount or lower price.
- Disadvantage: Bond investors. The lower present value translates to a lower return on their investment.
- The discount rate has a significant impact on the value of a bond. It's important to consider these factors when making investment decisions.
Price-Yield Curve:
- This curve shows the relationship between a bond's price (on the y-axis) and its yield (on the x-axis).
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| Credits: https://www.rba.gov.au/education/images/explainers/bonds-and-the-yield-curve/bonds-and-the-yield-curve-02.jpg |
- The curve is convex towards the origin, which means it looks like a half-smile. Why? Because of the inverse relationship.
- For option-free bonds (bonds without embedded options like callable or convertible features), the price-yield curve is typically convex towards the origin.
- This means that as yields decrease (moving towards the right on the graph), bond prices increase, but not in a linear fashion.
- The increase in bond prices becomes more gradual at lower yields, reflecting diminishing returns in terms of price increase for each unit decrease in yield.
- The curve often resembles half of a smile, where it steepens as yields decrease (prices increase) and flattens out as yields approach very low levels.
- Visualization
Why is the Curve Curved?
The curve isn't a straight line because the impact of a discount rate change on the present value of cash flows isn't constant. Here's a simplified explanation:
- For bonds with a longer maturity, small changes in the discount rate can significantly impact the present value due to the time value of money. This is why the curve bends more for longer-term bonds.
- For bonds with a shorter maturity, changes in the discount rate have a smaller impact on the present value.
Understanding the price-yield curve is crucial for bond investors as it helps them assess the attractiveness of a bond based on its current price and prevailing interest rates.
Discount Rate vs Yield To Maturity
- Yield to Maturity (YTM):
- YTM is the total return anticipated on a bond if it is held until maturity.
- It takes into account the bond's current market price, coupon payments, and the time remaining until maturity.
- YTM is essentially the internal rate of return (IRR) of an investment in the bond if all coupons are reinvested at the YTM rate until maturity.
- It represents the effective interest rate that an investor will receive by holding the bond until maturity, assuming no default.
- Discount Rate:
- The discount rate, in the context of bonds, refers to the rate used to discount future cash flows of the bond to their present value.
- This rate is typically based on the current market interest rates and the credit risk associated with the bond issuer.
- It is used to calculate the present value of both the bond's coupon payments and its principal repayment at maturity.
- The discount rate reflects the required rate of return that investors demand for investing in a bond of similar risk.
- Relationship:
- YTM can be considered as a type of discount rate because it reflects the rate at which future cash flows (coupon payments and principal repayment) are discounted to arrive at the bond's current market price.
- However, the discount rate used in bond valuation and pricing is more broadly used to determine the present value of each cash flow (coupon and principal) separately, considering the time value of money and the risk associated with the bond issuer.
- YTM, on the other hand, is specifically focused on the total return an investor expects from holding the bond until maturity.
Valuation With a Single Yield (Discount Rate)
For an option-free coupon bond, the coupon payments can be valued as an annuity. In order to take into account the payment of the par value at maturity, we will enter this final payment as the future value. This is the basic difference between valuing a coupon bond and valuing an annuity.
For simplicity, consider a security that will pay $100 per year for 10 years and make a single $1,000 payment at maturity (in 10 years). If the appropriate discount rate is 8% for all the cash lows, the value is:
This is simply the sum of the present values of the future cash lows, $100 per year for 10 years and $1,000 (the principal repayment) to be received at the end of the 10th year, at the same time as the final coupon payment.
Take note of a couple of points here.
- The discount rate is entered as a whole number in percent, 8, not 0.08.
- The 10 coupon payments of $100 each are taken care of in the N = 10 entry;
- The principal repayment is in the FV = 1,000 entry.
- The PV is negative—it will be the opposite sign to the sign of the PMT and FV.
- The calculator is just “thinking” that if you receive the payments and future value (you own the bond), you must pay the present value of the bond today (you must buy the bond).
- That’s why the PV amount is negative—it is a cash outlow to a bond buyer.
- Just make sure that you give the payments and future value the same sign, and then you can ignore the sign on the answer (PV).
Valuation With a Single Yield and Semiannual Cash Flows
Bond Components
STRIPS - Zero-Coupon Treasury Bonds:
- STRIPS stands for Separate Trading of Registered Interest and Principal Securities.
- These are zero-coupon bonds issued by the U.S. Treasury Department.
- They aren't created directly by the Treasury but rather through a process called stripping.
The Stripping Process:
- A financial institution takes an existing Treasury coupon bond (a bond that pays periodic interest).
- This bond is then "stripped" into its two components:
- Coupons (C-STRIPS, TINTs, or INTs):
- These represent the individual interest payments that would have been received throughout the original bond's life. C-STRIPS (Coupon STRIPS):
- These represent the separate coupon payments of the original Treasury bond.
- They are fungible, meaning any C-STRIP of a specific maturity date can be used to fulfill the coupon payment for that date on any reconstituted bond of the same maturity.
- Principal (P-STRIPS, TPs, or Ps):
- This represents the face value of the bond, which is paid at maturity.
- These represent the separate principal payments of the original Treasury bond. Unlike C-STRIPS, P-STRIPS are not fungible across different bonds.
- Each P-STRIP is tied to a specific original bond and can only be used to reconstitute that bond's principal payment upon maturity.
- Reconstitution of Bonds:
- When a bond is reconstituted from its STRIPS:
- For coupon payments: Any C-STRIPS of the appropriate maturity can be used, regardless of which original bond they were stripped from.
- For principal payments: Only P-STRIPS that were stripped from the specific original bond can be used to reconstitute its principal payment.
Arbitrage Opportunities:
- The stripping process creates a secondary market for these individual components (P-STRIPS and C-STRIPS).
- In theory, arbitrage opportunities can arise when the relative prices of P-STRIPS and C-STRIPS become misaligned.
- An arbitrageur could:
- Buy the undervalued component (e.g., cheap P-STRIPS).
- Sell the overvalued component (e.g., expensive C-STRIPS).
- Lock in a risk-free profit by exploiting the price discrepancy.
Transaction Costs and Practicality:
- While arbitrage opportunities might exist, transaction costs associated with buying and selling these securities can be significant.
- These costs can include commissions, fees, and bid-ask spreads, which can eat into the potential profit.
- Often, these transaction costs outweigh the potential arbitrage gain, making it impractical to exploit these opportunities.
In essence:
STRIPS offer an alternative way to invest in Treasury securities by separating the principal and interest components.While arbitrage is a theoretical possibility, transaction costs often make it unrealistic.
Pricing Conventions Between Coupon Dates
- Clean and Dirty Bond Pricing
- Dirty Price
- The dirty price is the price that the seller of the bond must be paid to give up ownership.
- It includes the present value of the bond plus the accrued interest.
- The dirty price of the bond is sometimes referred to as the full price or invoice price.
- Clean Price
- The clean price is the dirty price less accrued interest:
- clean price = dirty price – accrued interest
- The clean price of the bond is sometimes referred to as the flat price or quoted price.
- Note that the dirty price includes the discounted value of the next coupon so that the method of calculating accrued interest does not matter. As long as the clean price is calculated as dirty price minus accrued interest, the sum of the clean price and accrued interest will equal the dirty price.
- The full price changes dramatically over time even when the market is unchanged, including a discontinuous jump on coupon payment dates, while the flat price changes only gradually over time. Therefore, when trading bonds day-to-day, it is more intuitive to track flat prices and negotiate transactions in those terms.
- Dynamics of a bond's price and cash flows around the coupon payment date:
- Bond Price Dynamics Within a Coupon Period:
- The full price of a bond is the present value of all its expected future cash flows, including coupon payments and the principal repayment at maturity.
- As time progresses within a coupon period, the present value of the remaining cash flows increases. This is because each subsequent coupon payment becomes closer and more certain, adding value to the bond.
- Effect of Coupon Payment Date:
- Just before the coupon payment date, the bond's price is the present value of all future cash flows up to that moment, including the upcoming coupon payment.
- The present value calculation incorporates the full coupon payment expected to be received shortly.
- Immediately after the coupon payment is made, the bond's price drops by the amount of the coupon payment. This occurs because:
- The coupon payment, which was previously a future cash flow, is now a realized cash flow.
- The present value of the remaining cash flows is recalculated without including the coupon payment that has just been paid out.
- Illustrative Example:
- Suppose a bond pays a $50 coupon semi-annually. Just before the coupon payment date, the bond's price reflects the present value of all future cash flows, including the $50 coupon about to be received.
- After the coupon is paid, the bond's price immediately drops by $50. This is because the present value calculation now starts anew for the remaining future cash flows, which no longer include the $50 coupon that has just been paid out.
- Market Response:
- In the financial markets, this phenomenon is known as the "ex-coupon" effect.
- When a bond trades "ex-coupon," its price is typically lower by the amount of the coupon that has just been paid.
- Investors buying the bond after the ex-coupon date do not receive the upcoming coupon payment, and therefore, they pay a lower price to compensate for this missed cash flow.
- In summary, the bond's full price increases over time within a coupon period as future cash flows become closer and more certain. However, immediately after a coupon payment is made, the bond's price falls by the amount of the coupon payment because that cash flow is no longer included in the present value of future expected cash flows. This reflects how bond prices adjust based on the timing of coupon payments and the present value of cash flows at any given moment.
- Accrued Interest:
- When bonds are purchased between coupon dates, the buyer owes the seller the accrued interest for the period from the last coupon payment up to the settlement date of the transaction.
- Accrued interest is calculated based on the fraction of the coupon period that has elapsed since the last coupon payment.
- The formula for accrued interest depends on the bond's coupon rate, the number of days since the last coupon payment, and the total days in the coupon period.
- Eg: Consider a $100 par value bond that pays 3% coupon semiannually. This means a coupon of $1.50 is paid every six months. If the bond is sold (and settles) 41 days after the last coupon, the buyer will need to pay the seller $1.50 * 41 / 182 = $0.3379 for every $100 purchased.
- Eg: A $1,000 par value U.S. corporate bond pays a semiannual 10% coupon. Assume the last coupon was paid 90 days ago and there are 30 days in each month. Accrued interest is computed as follows:
- AI = $50 ( 90 / 180 ) = $25
- Here,
- $50 = semiannual value 10% coupon for $1000 par value annually is $100/2
- 180 = 30 * 6 months
- Eg: A EUR 100,000 par value French corporate bond pays 3.5% coupon with a semiannual frequency. Assume the last coupon was paid 75 days ago and there are 30 days in each month. The accrued interest is closest to:
- When calculating the discount factor, the amount of the accrued interest needs to be added to both the bid and ask quotes before calculating the midpoint.
- Fractional Period Compounding:
- Bonds typically pay coupons semi-annually (every six months), but when bonds are purchased between these dates, the actual period to the next coupon payment may not be exactly six months.
- To account for this, the interest accrued during the fractional period is calculated based on the actual number of days in that period, rather than assuming a full six-month period.
- Day Count Convention:
- The day count convention determines how interest accruals are calculated based on the number of days in the period.
- Several day count conventions are used in practice in the bond markets. The day count used will depend on the type of security. Common day count conventions include:
- 30/360: Assumes every month has 30 days and every year has 360 days.
- U.S. corporate and municipal bonds pay semiannual interest with a 30/360 day count.
- Actual/360: Uses the actual number of days in a month and assumes a 360-day year.
- In money markets, for discount securities and floating legs of interest rate swaps, the actual/360 day-count convention is used.
- Actual/Actual: Uses the actual number of days in both the numerator and the denominator.
- U.S. government bonds pay coupons semiannually and have an actual/actual day count.
- Actual/365: Uses the actual number of days in a year (365 days).
- An actual/365 day count is typically used for money market securities in Canada, New Zealand, and Australia.
- The day count convention affects how accrued interest and yield calculations are performed.
- We need to modify the bond pricing formula to incorporate the appropriate day count convention. Specifically, the bond pricing equation becomes:
- Formula
- When expressing w in the preceding equation, the number of days to use for the coupon period is determined by the appropriate day count convention.
- For example, the denominator is 180 for semiannual bonds that use the 30/360 convention. This equation computes the dirty price the bond because it includes the discounted value of the first full coupon payment even though the accrued interest belongs to the seller of the bond.
- Eg:
- Ronam Ltd. invests in semi-annual US Treasury bonds with face values of USD 1,000 of 15 August 2020. A bond made a coupon payment of USD 40 on February 15, 2017. The next coupon is due on August 15, 2017. If the quoted price for the bond for delivery on June 15, 2017, is USD 1001-16, then what is the full price of the bond?
- Previous coupon date (Feb 15, 2017) -> 120 days
- Settlement date (June 15, 2017) -> 61 days
- Next coupon payment date (Aug 15,2017) -> 120+61 -> 181 days
- Accrued interest using actual/actual day-count- convention:
- Accrued interest = USD 40 * (120/181) days = USD 26.5193
- Full price = Quoted price + Accrued price = 1,001.50 + 26.5193 = USD 1028.0193
- Note: 1001-16 = 1,001 + 16/32 = 1,001.5
- Eg:
- A $1,000 par value U.S. corporate bond pays a semiannual 10% coupon. Assume the last coupon was paid 100 days ago and there are 30 days in each month. The accrued interest is closest to:
- Coupon Rate per Period:
- The bond pays a 10% coupon semiannually, so each coupon payment is 10% / 2 = 5% of the face value.
- Since the face value is $1,000, the coupon payment amount is 5% * $1,000 = $50.
- Days in Coupon Period:
- We're assuming a 30/360 day count convention (30 days per month, 360 days per year).
- A semiannual coupon period consists of 360 days / 2 = 180 days. Proportion of
- Coupon Period Elapsed:
- The last coupon was paid 100 days ago.
- So, the proportion of the coupon period elapsed is 100 days / 180 days = 5/9.
- Accrued Interest:
- The accrued interest is the coupon payment amount multiplied by the proportion of the coupon period that has elapsed.
- Accrued Interest = $50 * (5/9) = $27.78 (rounded to two decimal places). Therefore, the accrued interest on the bond is closest to $27.78.
- In summary, when purchasing bonds between coupon dates, one must account for accrued interest, calculate interest for the fractional period correctly, and use the appropriate day count convention to ensure accurate calculations of interest payments and yields.
- These considerations are crucial for both buyers and sellers to understand the exact financial obligations and returns associated with bond transactions.
Discount Factors for Treasury Bills
- Treasury bills are securities that mature within one year and are issued by governments to inance their short-term funding needs.
- The cash price paid for a Treasury bill is a function of the maturity price (e.g., 100), quoted price (Q), and number of calendar days until maturity (n).
- This can be expressed as:
- cash price = 100 * Qn / 360
- If the Treasury bill matures in one year and n = 360, then the price paid by a buyer would be 100 – Q. In other words, the buyer would pay 100 – Q today and receive 100 in 360 days.
- Note that the quoted price, Q, is essentially the annualized discount of the Treasury bill.
- The quoted price is referred to as the clean price and does not include accrued interest. The cash price is referred to as the dirty price and includes accrued interest.
- Formula for calculating the discount factor:
- Discount Factor = 1 / (1 + discount rate * time to maturity)
- Where:
- Discount rate: The interest rate on the T-bill (expressed as a decimal).
- Time to maturity: The time remaining until the T-bill matures, typically measured in years or fractions of a year.
- Eg:
- Let's say you're considering a 182-day T-bill with a face value of $10,000 and a discount rate of 5%.
- Convert the time to maturity to years: 182 days / 365 days/year = 0.5 years
- Calculate the discount factor: Discount Factor = 1 / (1 + 0.05 * 0.5) = 0.9757
- Multiply the discount factor by the face value to get the purchase price:
- Purchase price = $10,000 x 0.9757 = $9,757
- In this example, you would pay $9,757 for the T-bill and receive $10,000 at maturity. The difference of $243 represents your earned interest.
- We could calculate a cash price based on both the bid and ask quotes for the bill. The midpoint of these two values is the discount factor.
- The bid price is the highest price an investor is willing to pay for a security.
- The ask price is the lowest price a seller is willing to accept for a security.
- The discount factor is a value between 0 and 1 that reflects the present value of a future cash flow (face value) received at maturity. The midpoint between the bid and ask price is considered the discount factor in this context.
- Eg:
- If the cash price based on the bid for a security that matures in 80 days is calculated as 99.60 and the cash price based on the ask is 99.65, the midpoint is 99.625, or 0.99625.
- A security worth $100,000 in 80 days would be priced at $99,625 today. Therefore, the 0.99625 is the discount factor for this maturity date.
- If a security was priced at $100,000 today, it would be worth $100,000 / 0.99625 = $100,376.41 in 80 days based on the midmarket discount factor.
Discount Factors for Treasury Bonds
- Treasury bonds are securities issued by governments to finance their mid- or long-term needs.
- They promise a stream of future cash lows, and are therefore deined by their face value, cash low (coupons), and maturity.
- A series of Treasury bond (T-bond) prices can be used to generate the discount function.
- Eg:
- Below selected T-bond prices for semiannual coupon $100 face value bonds. Settlement is T + 1. Generate discount factors for the dates indicated.
- Bond 1: When this bond matures on November 15, 2021, it will repay its principal of 100 and will make its last interest payment of:
- (0.0425 / 2 * 100) = 2.125
- The current cash price of the bond is 101.50. Therefore:
- d(1) = 101.50 / (100 + 2.125) = 0.9939
- Moving farther out on the curve, the function becomes slightly more complex, as each point of the curve must be included.
- For example, to solve for Bond 2, we must include both d(1) and d(2).
- Bond 2: The coupon payment at Time 1 is 7.25 / 2 = 3.625. The inal cash flow at Time 2 is 100 + 3.625 = 103.625. These two cash flows discounted back to present value using the discount function should equal the price of the bond:
- [3.625 × d(1)] + [103.625 × d(2)] = 105.98
- Since it’s already known that d(1) = 0.9939:
- (3.625 × 0.9939) + [103.625 × d(2)] = 105.98
- d(2) = 0.9880
- Using the same methodology for Bonds 3, 4, and 5:
- Bond 3: [1.0 × d(1)] + [1.0 × d(2)] + [101 × d(3)] = 101.22
- Thus: d(3) = 0.9825
- Bonds 4 and 5: d(4) = 0.9731 d(5) = 0.9633
- Summary of Discount Factors
Determining Value Using Discount Functions - Law of one price
- The law of one price is an economic principle that states that identical goods should sell for the same price in different markets when there are no transportation costs and no differential taxes applied to the goods in those markets.
- This concept is rooted in the idea of arbitrage, where any price difference between identical goods in different markets would quickly be eliminated by market forces.
- If investors are able to exploit a mispricing because of the law of one price, it is referred to as an arbitrage opportunity. To take advantage of an arbitrage opportunity, investors should short sell the more expensive instrument/portfolio and buy the cheaper instrument/portfolio. Since both provide identical future cash lows, the investor can then generate a proit.
- Example of the Law of One Price: Let's consider a hypothetical example with gold:
- Identical Good: Gold bars of the same purity (e.g., 99.99% pure gold).
- Different Markets: Suppose there are two markets, Market A and Market B, in different countries.
- No Transportation Costs or Trade Barriers: Assume there are no transportation costs, tariffs, or other barriers to trade between these markets.
- Application of the Law:
- In Market A, the current price of a 1-ounce gold bar is $2,000.
- In Market B, the current price of a 1-ounce gold bar is $1,950.
- According to the law of one price, these two prices should converge because the gold bars are identical and there are no obstacles to arbitrage. Here’s how the market would react:
- Arbitrage Opportunity: Traders could buy gold bars in Market B at $1,950 and sell them in Market A for $2,000, making a profit of $50 per ounce (excluding transaction costs).
- Market Adjustment: As traders exploit this price difference, the increased demand for gold in Market B would push prices up, while the increased supply in Market A would push prices down, eventually leading to the prices in both markets converging towards the equilibrium price, likely somewhere between $1,950 and $2,000.
- Elimination of Price Difference: Once the prices stabilize, the law of one price suggests that the price of gold bars of identical quality should be the same in both Market A and Market B, barring any new factors that could affect the price.
- In essence, the law of one price highlights the tendency of markets to equalize prices for identical goods across different locations when market conditions allow for free trade and arbitrage. Also in other words if the law of one price is not present it will allow people to do arbitrage, excluding the cost involved.
- Arbitrage means a transaction, in which there is zero net investment and positive payoff. Considered to be risk less investment.
- Short positions:
- Short positions are important considerations for arbitrage.
- Short positions involve selling securities the investor does not own, with the expectation that the security price declines and the investor can repurchase the security at a lower price.
- If the security pays income (coupon for bonds or dividends for equities), the investor must pay this income to the lender of the security.
- The risk of short positions is that the security price moves up, or that the security can no longer be borrowed and the investor needs to buy back the security (potentially at a loss).
- Example:
- Suppose you observe the annual coupon bonds. The 2-year spot rate is 12%. Is there an arbitrage opportunity? If so, describe the trades necessary to exploit the arbitrage opportunity.
- Input:
- Here:
- CR = Coupon Rate
- YTM = Yield to Maturity
- FV = Face Value
- CMP = Current Market Price
- Spot Rate for 2yrs = 12%
- Spot Rate Definition:
- The spot rate, also known as the zero-coupon yield or the spot yield, is the yield or interest rate on a bond that pays no periodic interest payments (coupon payments).
- Instead, it is issued at a discount to its face value and pays the face value at maturity.
- The spot rate is the rate of return an investor would earn if they bought the bond today and held it until maturity.
- Spot Rate for 2 years = 12%:
- This statement specifically indicates that the annualized yield to maturity on a theoretical zero-coupon bond that matures in 2 years is 12%.
- Sell = Get Cash
- Buy = Pay Cash get Security
- Step 1: Buy Bond3 for $1 million of the 2-year, 10% coupon bonds.
- Step 2: Short sell Bond1 $10,000 of the 1-year, zero-coupon bonds at 95.23.
- Step 3: Short sell Bond2 $110,000 of the 2-year, zero-coupon bonds at 82.64.
- The result is receiving positive income today in return for no future obligation, which is an arbitrage opportunity.
Constructing a Replicating Portfolio
- Constructing a replicating portfolio involves using a combination of different fixed-income securities to replicate the cash flows of a given fixed-income security.
- Here this is another way of identifying arbitrage opportunities.
- Example:
- Suppose a 5-year fixed-income security exists with $1000 face value and a 20% coupon rate. The coupons are paid on a semiannual basis, and the security’s DR is assumed to be 10%. The present value of this bond, Bond 1, and its cash lows are calculated as follows:
- Original Bond1:
- Face Value - FV: $1000
- Coupon Rate - CR: 20%
- Maturity - n: 5years
- Discount Rate - DR: 10%
- Present Value - PV or Current Market Price - CMP: $1379.08 (using calculator)
- If this bond is determined to be trading cheap, then a trader can conduct an arbitrage trade by purchasing the undervalued bond and shorting a replicating portfolio that mimics the bond’s cash lows.
- To demonstrate the creation of a replicating portfolio, assume the following four fixed-income securities exist in addition to the bond we are trying to replicate.
- Other Bonds:
- The goals is to use the above bonds and try to replicate the Bond1. Combinations of these five bonds can help in matching the cash flow which is the same characteristics. As the bonds with same cash flow should be priced same in the market.
- First lets try to match the cash flow and then we can look into the pricing arbitrages.


















