December 13th, 2007, 3:02 pm
The issue is credit premia: 1yr Libor deposit contains the risk of lending to AA-rated bank counterparties for 1yr. ED futures and IR swaps are indexed to 3m Libor, which contains the risk of lending to AA-rated bank counterparties for 3m. You could lend for 1yr at Libor (or close to it - I'm sure given the dash for cash at the moment, if you put an offer around libor in the bookies you would get taken) and do the futures against it, but you are not purely taking a position on interest rates - you have exposed yourself to the default on principal. This would also be the case if you arranged a 3m loan today (there are no offers in the brokers for 3m cash, so you would find this difficult) and forward starting loans priced at around where the EDs are implying 3m Libor to set.The seize-up of funding markets as a result of liquidity puts to SIVs, strains on capital ratios due to write-downs etc, has effectively meant that nobody wants to lend money, so the premia demanded for lending term has increased, and this is reflected in the Libor fixes. A simple way to gauge this is to look at money market basis swap spreads - eg 3m-6m basis swaps, for 1yr maturity, you can pay 6m libor flat and receive 3m libor + 10.875bp. The basis spread represents the credit risk-premia demanded for lending 6m vs 3m on a rolling basis for 1yr.Regarding your question about what rate to use for discounting the payment in 1yr's time: that depends entirely on the credit-worthiness of the counterparty paying you the money. If you have a collateralisation agreement with the counterparty, then use the curve that is build from 3m deposit+futures+swaps (MTM is collateralised with US 3m Libor). If they are AA-rated bank counterparty but there is no collateralisation agreement, then it would be closer to 1yr libor. Kind of varies, but the easiest thing to assume is that you have collateralisation and use the normal 3m deposit+futures+swap curve to discount.