[puzzlingcaptcha]

Crop futures are already a thing. Potatoes are traded on EEX for example: https://www.eex.com/en/markets/agriculturals/potatoes

[president_zippy]

I'm glad someone pointed that out. They even have call and put options, and thousands of FPGAs in Chicago trying to arbitrage deviations from put-call parity from market open to market close.