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Chapter 6 Interest Rate Futures Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 20141 Day Count Convention Defines: the period of time to which the interest rate applies The period of time used to calculate accrued interest (relevant when the instrument is bought of sold Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 2 Day Count Conventions in the U.S. (Page 132) Treasury Bonds:Actual/Actual (in period) Corporate Bonds: 30/360 Money Market Instruments:Actual/360 Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 3 Examples Bond: 8% Actual/ Actual in period. 4% is earned between coupon payment dates. Accruals on an Actual basis. When coupons are paid on March 1 and Sept 1, how much interest is earned between March 1 and April 1? Bond: 8% 30/360 Assumes 30 days per month and 360 days per year. When coupons are paid on March 1 and Sept 1, how much interest is earned between March 1 and April 1? Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 4 Examples continued T-Bill: 8% Actual/360: 8% is earned in 360 days. Accrual calculated by dividing the actual number of days in the period by 360. How much interest is earned between March 1 and April 1? Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 5 The February Effect (Business Snapshot 6.1) How many days of interest are earned between February 28, 2015 and March 1, 2015 when day count is Actual/Actual in period? day count is 30/360? Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 6 Treasury Bill Prices in the US Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 7 Treasury Bond Price Quotes in the U.S Cash price = Quoted price + Accrued Interest Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 8 Treasury Bond Futures Pages 135-140 Cash price received by party with short position = Most recent settlement price Conversion factor + Accrued interest Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 9 Example Most recent settlement price = 90.00 Conversion factor of bond delivered = 1.3800 Accrued interest on bond =3.00 Price received for bond is 1.380090.00+3.00 = $127.20 per $100 of principal Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 10 Conversion Factor The conversion factor for a bond is approximately equal to the value of the bond on the assumption that the yield curve is flat at 6% with semiannual compounding Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 11 CBOT T-Bonds FRA is settled at the end of the underlying three- month period Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 20 Forward Rates and Eurodollar Futures continued A “convexity adjustment” often made is Forward Rate = Futures Rate0.5s2T1T2 T1 is the start of period covered by the forward/futures rate T2 is the end of period covered by the forward/futures rate (90 days later that T1) s is the standard deviation of the change in the short rate per year Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 21 Convexity Adjustment when s=0.012 (page 144) Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 22 Maturity of Futures (yrs) Convexity Adjustment (bps) 23.2 412.2 627.0 847.5 1073.8 Extending the LIBOR Zero Curve LIBOR deposit rates define the LIBOR zero curve out to one year Eurodollar futures can be used to determine forward rates and the forward rates can then be used to bootstrap the zero curve Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 23 Example (page 144-145) so that If the 400-day LIBOR zero rate has been calculated as 4.80% and the forward rate for the period between 400 and 491 days is 5.30 the 491 day rate is 4.893% Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 24 Duration Matching This involves hedging against interest rate risk by matching the durations of assets and liabilities It provides protection against small parallel shifts in the zero curve Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 25 Use of Eurodollar Futures One contract locks in an interest rate on $1 million for a future 3-month period How many contracts are necessary to lock in an interest rate on $1 million for a future six- month period? Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 26 Duration-Based Hedge Ratio VFContract price for interest rate futures DFDuration of asset underlying futures at maturity PValue of portfolio being hedged DPDuration of portfolio at hedge maturity Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 201427 Example It is August. A fund manager has $10 million invested in a portfolio of government bonds with a duration of 6.80 years and wants to hedge against interest rate moves between August and December The manager decides to use December T-bond futures. The futures price is 93-02 or 93.0625 and the duration of the cheapest to deliver bond will be 9.2 years at the futures contract maturity The number of contracts that should be shorted is Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 28 Limitations of Duration-Based Hedging Assumes that only parallel shift in yield curve take place Assumes that yield curve changes are small When T-Bond futures is used assumes there will be no change in the cheapest-to-deliver bond Options, Futures, and Other Derivatives, 9th Edition, Copyright John C. Hull 2014 29 GAP Management (Business Snapshot 6.3) This is a more sophisticated approach used by banks to hedge interest rate. It involves Bucketing the zero curve
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