I'll only just say that if there are 540 turns left, it isn't worth stocking any food above $41.

it's easy to do spot checks and to see which is more efficient at a given point. For example, say you have $4b on hand, you are losing .1%, or $2m/turn, on that excess $2b. There's roughly 540 turns remaining. 2m * 540 = $1,080,000,000 corruption costs. Spending that excess $2b on $49 food (current price) buys you 38,505,968 bushels, which can be resold at a minimum of $35 on the private market for $1,347,708,895, or a cost of $652,291,105... so stocking is actually already *far* better than eating corruption, even at the current price, in this scenario.