I've noticed that in Tiny Tower most of the Food category businesses have very short restock times and thus very low stock count. Any time I don't check the game for more than 15 minutes my restaurants are always out of stock, and I'm usually out of stock before I can stock a second item.
I found the Donut Shop actually has very deep stock with long restock times; two hours to restock almost 3000 bearclaws. Do any other restaurants have stocks this large?