I'd suggest this is more of an endorsement of free trade. (That is, no external party forced you to trade goats for seeds.)

Lots of societies have free trade that I don't think would be usefully described as "capitalist." (And anecdotally societies in which free trade is discouraged seem to end up with a lot of black market free trade activity -- it is just too powerful an attractor.)

To me capitalism is a more descriptive of a narrower and more modern development. Free trade is an aspect of it, but not sufficient to describe it.