Well I used to compare after market tax without expenses. I think that is reasonable so for techer ~1/3 tpt/acre and tech sells at 3000 means $1k/acre/turn except I would add tax income to that. Techer naturally stands out but it used to be quite informative to see at what market prices different strategies/govts were competetive.

Thing is I don´t remember the formulas and some of them seem to have changed since last I played (swirve days).

Edit: I have noticed the changes to the private market which have helped to raise the public market price for food. If all else is equal this should make farmer more competetive in general. However, all else is not equal. :)