Could futures transactions be described as "selling a debt for a debt"?

I read something like this but didn't really understand what it means, could you explan it to me? And if the statement is untrue, are there any other economic transactions which could accurately be described as such?

Submitted March 21, 2016 at 11:09AM by for-love-of-me http://ift.tt/1Uyh1Pv