I am looking for information on a short story that was written probably in the late 60's early 70's. This was part of a short story collection; I can't be certain but it was possibly edited by Groff Conklin.
The story is told from the point of view of the aliens who meet human explorers on a planet they have both landed on. We can tell because of the description that the narrators provide of the humans. I remember specifically they thought the humans skin was ugly - too thin, they could see parts of the circulatory system through the skin.
The aliens are entranced with the human's hydroponic system, have never seen anything like it. The don't explicitly use the term 'hydroponics' since they've never see one before, but evidently food is in short supply and they really need something like this. The aliens, though, have this really cool pop-up survival tent that incorporates life support, power, etc. The humans and aliens swap hydroponics for the tent. Each think they've taken advantage of the other.
At the end, both high-tail it off the planet fearing the others will realize they've been ripped off and change their minds. The final line, said by the alien, is something like "The way they're behaving would make you believe that they - not we - have committed the perfect crime."