Lecture 8
Longer term bonds prices are more sensitive to interest rate changes If a bond is more sensitive to interest rate changes, it is riskier Maturity and “Duration” tell us “HOW SENSITIVE” Bond Price YTM
Interest rate, percent Bond Price, percent
Maturity (years)YTM 13.0% 53.5% 103.8% 154.1% 204.3% 304.5% Usually the yield on treasuries (but can be any category of bond) The Living Yield Curve ieldcurve ieldcurve
Interest Rates Maturity (years)
Feb 2004 Nov 2014
Term Structure & Yield Curve Spot Rate - The actual interest rate today (t=0) Forward Rate - The interest rate, fixed today, on a loan made in the future at a fixed time. Future Rate - The spot rate that is expected in the future Yield To Maturity (YTM) - The IRR on an interest bearing instrument YTM (r) Year & present
Debt & Risk Duration Duration is the average point in time at which a bond holder receives the cash flows from the bond, adjusted for the time value of money (i.e. present value). Used to measure the average life of debt, on a present value basis Is the tool that tells us the difference in risk between two different bonds.
Macauley Duration Formula C t (t) ( 1 + R ) t P o D = t = 1 n
Debt & Risk Example (Bond 1) Calculate the duration of a 5 year 10.5% coupon 8.5% YTM of Total PV% x Year
Debt & Risk Example (Bond 1) Calculate the duration of a 5 year 10.5% coupon 8.5% YTM of Total PV% x Year
Debt & Risk Example (Bond 1) Calculate the duration of a 5 year 10.5% coupon 8.5% YTM of Total PV% x Year
Debt & Risk Example (Bond 1) Calculate the duration of a 5 year 10.5% coupon 8.5% YTM of Total PV% x Year
Debt & Risk Example (Bond 1) Calculate the duration of a 5 year 10.5% coupon 8.5% YTM of Total PV% x Year Duration
Debt & Risk Example (Bond 2) Given a 5 year, 9.0%, $1000 bond, with a 8.5% YTM, what is this bond’s duration? of Total PV% x Year Duration
Modification of the Macauley formula may produce Po R Po (1 + R ) = - D or Po Po = - MD ( R ) D (1 + R ) MD =
Duration & Bond Price Volatility Example The duration of a bond is The price of the bond is If the YTM increases from 6.05% to 6.25%, what is the change in the bond price? Po ( ) = Po = - $ 4.35 Price drops