What item do you find turns the fastest profit in the Trade Depot

When I first had the capability to manufacture minerals, I sold them in the depot and they went like hotcakes. Maybe it was because a lot of others were in the same point in the game as me. Tables sell pretty quickly. I put a smoothie up one day and it went in minutes. No one buys donuts because everyone has jacked up the price waiting for Daniel to buy them. Anything that helps expand your storage or buy land expansions are hot hot hot. I have trouble buying those and I never sell them.