>>543893537
Also thanks to selling food one thousand tons at a time, I figured out how the market works ingame. It's quite disappointing, any price effect from your sales and purchases lasts for about two months and then is completely reset.

Also buying crops doesn't increase the price of food or fabric, or anything else. So far the only cross-influence I found was waste, because when buying or selling waste the price is a combination of all its component waste and scrap types. So for example if you tank the price of scrap metal it'll make buying toxic waste a bit more profitable.