The reference price of futures up and down is the settlement price of the previous trading day, with corn futures 2021.06.28 the main 2109 contract settlement price of 2594, fluctuations of 1%, that is, 2594 × 1% = 25.94, corn futures, the smallest change in the price of $1 / ton, rounded up to the nearest $26 / ton, corn futures contract unit is 10 tons / hand, a hand of profit and loss is 260 dollars.