Shouldn't there be two prices on every item? A cost for buying it, and a price for selling it?

Right now, things cost the same to buy and sell

Right. Another note though: it seems like the information board (current cash, income, expenses, profit) is a little buggy: sometimes it would display income or profit when nothing was imported/exported (and the cash value was still). I could attribute this to gaining money the latest minute, but the problem with that would be that it didn't shrink with time