The reason why the closing price of futures is quite different from the selling price is because the futures market is a match, not a bidding transaction. In a matching transaction, the quotations of buyers and sellers will be matched together to form the final transaction price. Therefore, if many people in the market want to buy or sell the same futures contract, their quotations will match together to form the final transaction price. This transaction price may be higher or lower than either party's quotation, depending on how many people in the market want to buy and sell this futures contract.