2050/427=4.8, which is greater than the normal ratio of 4.7. Therefore, according to the price difference, return to the normal interval estimation, short domestic soybeans and do more. That is, buy 10 domestic soybean empty orders, and then buy 10 American beans at the same time. On February 28th 12, the positions were closed simultaneously. Domestic soybean is empty, 2050-2068=- 18 yuan/ton, each lot 10 ton, 10 empty lot, loss 1800 yuan. The US beans closed more than one order, 450-427=23 cents/bushel, 5000 bushels per lot, 10 lot, and the profit was 1 1500 USD. At the exchange rate of 6.8, 1 1500 USD is equivalent to 78,200 yuan. Total profit: 78,200-1800 = 76,400 RMB. In fact, this is not arbitrage, because the quantity of soybeans bought in the United States has seriously exceeded the standard. The standard weight of 1 bushel soybeans is 27.2 15 kg, and only 367 is needed for each 10 ton of domestic soybeans (that is, the first-hand domestic soybean futures contract).