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Textbooks usually state that if an asset's prices are positively correlated with interest rate movements, then its Futures price is going to be greater than its Forward Price assuming the same maturity.

The reasoning is that if you're long futures and the asset's prices increase along with interest rates, then you'll get to re-invest your gains at a higher rate. On the flip side during losses, you'll get to borrow at lower interest rates. This is not possible with forwards since they aren't marked-to-market daily. Hence, futures prices should exceed the forward price.

Does the logic hold from the short's perspective as well?

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  • $\begingroup$ I would expect an asset that has a future contract to have an OTC forward contract which is MTM and collateralised. There is a very large cost to trading uncollateralised contracts these days. So out of interest I want to challenge someone to give an example of an instrument with a futures contract and a tradeable forward market which is uncollateralised... $\endgroup$ – Attack68 Jun 24 '18 at 15:52
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Consider a short futures vs short forward contract on the same asset. The futures will make profits when the asset prices go down, but would get to re-invest at a lower rate. On the flip side during losses, you'll have to borrow at higher rates. Clearly the short is getting the worse end of the bargain. If $F_{0,T}$ is the futures price at which you entered the short, while $F_{t,T}$ is the price at time at which you're evaluating the position, the profit is given by-

$$F_{0,T}-F_{t,T}$$

The above suggests that the way to compensate the short leg for getting the short end of the stick is by increasing $F_{0,T}$ relatively speaking. This is also what we got for the long leg, and hence futures prices will tend to be higher than the corresponding forward price in case of expected positive correlation with interest rates.

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