The reason why semi-finished dishes are cheap is that they use simple ingredients, have plenty of time, and operate on an assembly line. The ingredients are simple, and the semi-finished products are ingredients that are relatively easy to store. The price is generally relatively cheap, low-cost, and easy to store. Unlike vegetables, it is not easy to store for a long time, so the price is generally more expensive. If you have enough time to make pre-made dishes, the labor cost can be reduced a lot. Assembly line operation, large quantities can easily reduce production costs, just like factories, large quantities and sufficient goods.