The single unit price is to accurately determine the unit price of each project of the project, and then use the quantity at the time of completion to multiply the unit price agreed later to settle the account.

Settlement price refers to the price when the buyers and sellers conduct currency transactions, usually refers to the weighted average price of the transaction price of the futures contract on the same day according to the volume, which is used as the basis for settlement on the same day.

Unit price usually refers to the estimated unit price and estimated unit price of construction and installation projects, including labor cost, material cost and machinery cost.