A shop allows trading without the involvement of the shop owner. Each shop is assigned to the land where it is placed. All buy and sell orders in the shop are automatically added to the common Market orders table.
A shop occupies a part of the land's warehouse which is equal to the sum of active orders.
Example: If there are 100 free cells in the warehouse, you can create orders for a maximum of 100 and the warehouse will have 0 cells left.