The price of each contract has its own price in April. Or every contract; At the time of trading (trading at the same time) has its own price.
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The commodity variety, trading unit, contract month, margin, quantity, quality, grade, delivery time and delivery place of futures contracts are all established and standardized, and the only variable is price. The standards of futures contracts are usually designed by futures exchanges and listed by national regulatory agencies.
Futures contracts are concluded under the organization of futures exchanges and have legal effect. Prices are generated through public bidding in the trading hall of the exchanges. Most foreign countries adopt public bidding, while our country adopts computer trading.
Baidu encyclopedia-futures