the only economy that makes sense is one that’s #ValueForValue otherwise it *is* unethical, time arbitrage is perfectly fine when it’s based off a #V4V exchange.

e.g. Futures contracts for wheat production; farmer gets money to live through the year, contract holder gets wheat at the end as “profit” & since the value given isn’t inflated away you don’t need to worry about yield on savings.

it becomes an issues when you start gambling on the outcomes of these contracts, especially when they can be manipulated for financial gain.