2.08% is the interest rate, which is equivalent to investment 10000 yuan, with interest of 208 yuan. Long and short: judging the subsequent market rise, you can buy futures contracts at a low price, wait for the price to rise to the target price, sell and close positions, and make money in the middle price difference; Short selling: judging that the subsequent market will fall, you can sell the futures contract at a high level first, and then buy and close the position at a low price after the price falls, and the profit is also the difference.