Flat cabin: the concept of transportation refers to the need to mobilize and level the bulk cargo such as coal and grain piled into the cabin in order to maintain the pressure balance and navigation safety of the ship after the cargo is loaded. This operation is called "leveling".

Therefore, "fair price" refers to the price of goods transported to the port and loaded on board (all expenses incurred before sailing, including all expenses before boarding), but does not include related expenses thereafter.

And "liquidation" refers to hedging futures contracts held by opponents (selling long contracts or buying short contracts for hedging), that is, understanding the significance of holding positions.