# Derivative Strategies

Why long position in Bond Futures increases duration?

Not necessarily. Long position in bond futures will either decrease or increase overall portfolio duration. It depends on 1) duration of futures (let’s denote A), 2) duration of portfolio before adding futures (let’s denote B). If A > B, then overall portfolio duration will increase, if A

ok

[quote=“thinkwiseandact”]

Not necessarily. Long position in bond futures will either decrease or increase overall portfolio duration. It depends on 1) duration of futures (let’s denote A), 2) duration of portfolio before adding futures (let’s denote B). If A > B, then overall portfolio duration will increase, if A

With all due respect, you’re completely wrong here.

A long position in bond futures will, necessarily, increase a portfolio’s overall duration.

A long position in bond futures means that you have, essentially, already purchased the bonds, so the money duration of the futures is added to the money duration of the existing portfolio. But, because you haven’t paid anything for the futures, the money value of the portfolio hasn’t changed. A higher money duration divided by an unchanged portfolio value results in a longer duration.

Necessarily.

https://www.theice.com/publicdocs/futures/Managing_Bond_Portfolio.pdf

Here we have Scenario 1, in which case investor buys futures and says decreases duration. Are they wrong or do I miss something?

In their calculation, they include the price of their futures contract in the denominator. Therefore, it sounds as though you have to pay cash today for the full value of their futures contract.

Humbly: if that’s the case then it’s not a _ real _ futures contract. If it’s not the case, then their calculation is wrong.

In a real futures contract, your upfront cost is zero.

You should know this from your study of Level III derivatives. If you want to increase the duration of a fixed income portfolio you buy (i.e., take the long position in) bond futures contracts, and if you want to decrease the duration of a fixed income portfolio you sell (i.e., take the short position in) bond futures contracts. Whether the duration of those contracts is longer or shorter than the duration of your existing bond portfolio doesn’t change that fact.

By the way: I notice that the copyright on that page is 2014. Do these even still exist?