There should be prices offered on "Items in Demand"
in stations. So you can figure out which cargo will make you the most credits.

There already is, check in the "News" tab. There should be a topic that says "Local Items in Demand" and when you read it, it will show you which items are being sold for the most money.

Didn't he ask about *prices* (amount of money) of each item in demand? Anyway, I like his idea.