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Chapter 6

Chapter 6. The Risk Structure and Term Structure of Interest Rates. Risk Structure of Interest Rates. Bonds with the same maturity have different interest rates due to: Default risk Liquidity Tax considerations. Risk Structure of Interest Rates.

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Chapter 6

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  1. Chapter 6 The Risk Structure and Term Structure of Interest Rates

  2. Risk Structure of Interest Rates Bonds with the same maturity have different interest rates due to: Default risk Liquidity Tax considerations

  3. Risk Structure of Interest Rates Default risk: probability that the issuer of a bond is unable or unwilling to make interest payments or pay off the face value U.S. Treasury bonds are considered default free (government can raise taxes). Risk premium: the spread between the interest rates on bonds with default risk and the interest rates on (same maturity) Treasury bonds

  4. Response to an Increase in Default Risk on Corporate Bonds – Supply/Demand Application

  5. Russian Default

  6. Risk Structure of Interest Rates Liquidity: the relative ease with which an asset can be converted into cash Cost of selling a bond Number of buyers/sellers in a bond market Income tax considerations Interest payments on municipal bonds are exempt from federal income taxes.

  7. Interest Rates on Municipal and Treasury Bonds

  8. Taxes and Bond Prices • Coupon payments on municipal bonds are exempt from federal Income taxes • For 28% tax bracket: • After tax yield = (taxable yield) x (1 – tax rate) • 3.60% = 5% x (1 – 0.28) • Tax equivalent yield = http://www.bloomberg.com/markets/rates-bonds/government-bonds/us/

  9. Risk Structure of Long-Term Bonds in the United States

  10. Bond (credit) Ratings and Risk Bond Ratings - • Moody’s and Standard and Poor’s Ratings Groups • Investment Grade • Non-Investment – Speculative Grade • Highly Speculative

  11. Bond (credit) ratings

  12. Credit rating & historic default frequencies

  13. Default Risk – Price and YTM • Suppose risk-free rate is 4% • Suppose there is a company called FlimFlam that issues one-year, 4% coupon bond, FV=$100. • If risk free, the price of the FlimFlam bond is

  14. Default Risk Suppose 5% probability FlimFlam goes bankrupt – you get nothing • Expect to receive $98.80 one-year from now. • Discount at risk-free rate = • P = $95

  15. Default Risk Premium • We can calculate the probability of repayment from the interest rates. • Let 1+k be the return on a one-year corporate debt and 1+ i be the return on a one-year default risk-free treasury. • The probability of repayment is • the probability of default is 1 – p • The probability of repayment:

  16. Default Risk Suppose 10% probability FlimFlam goes bankrupt – you get nothing • Expect to receive $93.60 one-year from now. • Discount at risk-free rate = • Yield = ($104 / $90) -1 = .1555 or 15.55% • Default risk premium = 15.55% - 4% = 11.55%.

  17. Bond Ratings and Risk • Increased risk reduces bond demand. • The resulting shift to the left causes a decline in equilibrium price and an increase in the bond yield. • Bond Yield = U.S. Treasury Yield + Default Risk Premium • Risk spread or default risk premium = Bond Yield - U.S. Treasury Yield

  18. Information Content of Interest Rates:Risk Structure • When the economy starts to slow, this puts a strain on private firms. • A slower economy means a higher default probability • Risk Spreads increase.

  19. Information Content of Interest Rates: Risk Structure Risk spread = Baa Corporate minus 10-year Treasury

  20. Term Structure of Interest Rates Definition of the Term Structure:The relationship among bonds with the same risk, liquidity and tax characteristics but different maturities is called the term structure of interest rates. Yield Curve: A plot of the term structure, with the yield to maturity on the vertical axis and the time to maturity on the horizontal axis. http://finance.yahoo.com/bonds/composite_bond_rates?desktop_view_default=true

  21. Term Structure of Interest Rates

  22. Term Structure of Interest Rates http://stockcharts.com/index.html

  23. Term Structure of Interest Rates:Facts to Explain • Interest rates (Yields) on different maturities tend to move together • Yields on short-term bond are more volatile than yields on long-term bonds • Long-term yields tend to be higher than short-term yields. • Also want to explain the fact that yield curves can be inverted.

  24. Movements over Time of Interest Rates on U.S. Government Bonds with Different Maturities Sources: Federal Reserve: www.federalreserve.gov/releases/h15/data.htm.

  25. Three Theories to Explain the Three Facts • Pure Expectations Theory explains the first two facts but not the third • Segmented Markets Theory explains fact three but not the first two • Liquidity Premium Theory combines the two theories to explain all three facts

  26. Pure Expectations Theory • The interest rate on a long-term bond will equal an average of the short-term interest rates that people expect to occur over the life of the long-term bond • Key Assumption: Buyers of bonds do not prefer bonds of one maturity over another. • Bonds of different maturities are considered to be perfect substitutes

  27. Expectations Theory Notation interest rate on 1-year bond today (t). interest rate on 2-year bond today (t). interest rate on n-year bond today (t). interest rate on 1-year bond, 1-year from today (t+1). Expected interest rate on 1-year bond, 1-year from today (t+1). Expected interest rate on 1-year bond, n-years from today (t+n).

  28. A Note on Averages • Geometric average of and = • Arithmetic average =

  29. Expectations Theory: • Let the current interest rate on one-year bond (i1t) be 6%. • You expect the interest rate on a one-year bond next year ( ) to be 9%. • Then the expected return from buying 2 one-year bonds averages (6% + 9%)/2 = 7.5%. • Under the Expectations Theory the current interest rate on a two-year (i2t) bond must be 7.5% for you to be willing to purchase that bond. • Why?

  30. Example: 2 year investment horizon • Strategy 1: • Invest $1,000 for 2-years at 8%: • Ending Balance = (1+0.08)2($1,000) = $1,166.40 • Strategy 2: • Invest $1,000 1-year at 6% and expect 9% one year later: • Ending Balance = (1 +0.06)(1+0.09)($1,000) = $1,155.40 • Come out $11 ahead with Strategy 1. • What happens to S and D?

  31. Expectations Theory ( Math) 1. Return from a 2-year bond over 2 years 2. Return from a 1-yr bond and then another 1-yr bond 3. If one and two year bonds are perfect substitutes, then:

  32. Term Structure of Interest Rates:Expectations Theory From: We can derive the following arithmetic approximation: Which says the long-term interest rate = average of current and expected future short-term interest rates.

  33. Here is how we get the approximation:

  34. Here is how we get the approximation:

  35. Expectations Theory

  36. Actual math: No Approximation This is a geometric average

  37. Expectations Hypothesis - Arithmetic Average In words: The interest rate on a bond with n years to maturity at time t is the average of the n expected future one-year rates. Numerical example: One-year interest rate over the next five years 5%, 6%, 7%, 8% and 9%: Interest rate on a two-year bond: (5% + 6%)/2 = 5.5% Interest rate for a five-year bond: (5% + 6% + 7% + 8% + 9%)/5 = 7% Interest rate for one, two, three, four and five-year bonds are: 5%, 5.5%, 6%, 6.5% and 7%. This is the only interest rate that is known at time t

  38. Expectations Hypothesis Another example: One-year interest rate over the next five years 7%, 6%, 5%, 4% and 3%: Interest rate on a two-year bond: (7% + 6%)/2 = 6.5% Interest rate for a five-year bond: (7% + 6% + 5% + 4% + 3%)/5 = 5% Interest rate for one, two, three, four and five-year bonds: 7%, 6.5%, 6%, 5.5% and 5%.

  39. Recall the Fisher Equation: i = r + πe • Holding r constant: • If inflation is expected to rise in the future, expected one-year interest rates will rise and the yield curve will slope upward. • If inflation is expected to fall in the future, expected one-year interest rates will fall and the yield curve will slope downward. • If inflation is expected to remain the same in the future, expected one-year interest rates will remain the same and the yield curve will be flat.

  40. Term Structure of Interest Rates:Expectations Theory

  41. Using the Pure Expectations Theory to Solve for Expected 1-year (forward) Interest rates From the formula for the yield on a 2-year bond: From the formula for the yield on a 3-year bond: In general:

  42. Actual math: No Approximation

  43. Term Structure Facts and the Expectations Theory Expectations Theory Explains: • Interest Rates of different maturities tend to move together - long term interest rates are averages of expected future short-term interest rates. • Yields on short-term bond are more volatile than yields on long-term bonds – - long term interest rates are averages of expected future short-term interest rates. But Expectations Theory does not explain: 3.Long-term yields tend to be higher than short-term yields.

  44. Segmented Market Theory • Bonds of different maturities are not perfect substitutes for each other.

  45. Segmented Markets Hypothesis • Assumptions: • Investors have specific preferences about the maturity or term of a security. • Investors do not stray from their preferred maturity.

  46. Segmented Markets Hypothesis • The slope of the yield curve is explained by different demand and supply conditions for bonds of different maturities. • If the yield curve slopes up, it does so because the demand for short term bonds is relatively greater than the demand for long term bonds. • Short term bonds have a higher price and a lower yield as a result of the relatively greater demand. So the yield curve slopes upward.

  47. Segmented Markets Hypothesis Price Price S S P2s P1s P1l P2l D2s D1l D1s D2l 0 0 Quantity of Short-term Bonds Quantity of Long-term Bonds Upward Sloping Yield Curve

  48. Segmented Markets Hypothesis • The segmented markets hypothesis explains why…. • Yield curves typically slope upward. • On average, investors prefer bonds with shorter maturities that have less interest rate risk. • Therefore, the demand for short term bonds is relatively greater than the demand for long-term bonds

  49. Segmented Markets Hypothesis • But, the segmented markets hypothesis does not explain why… • Interest rates on different maturities move together. • The segmented markets hypothesis assumes that short and long markets are completely segmented.

  50. Liquidity Premium Theory of the Term Structure of Interest Rates • Yield curve upward slope is explained by the fact that long-term bonds are riskier than short-term bonds. • Bondholders face both inflation risk and interest rate risk. • The longer the term of the bond, the greater both types of risk. • Investors need to be compensated for the greater risk.

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