设定关注股票的百分比或者指定价格及日期。
Concerned about the setting or the percentage of shares specified price and date.
期货合约涉及在指定时间和以指定价格，出售或购买一定数量商品的义务。
Futures contracts involve the formal obligation to sell or buy a given amount of a commodity at a specified time and price.
大多情况下，消费者为一项商品指定价格的平均值最接近这项商品的合理价值。
In most cases, the rational value of a commodity is best approximated by the average value that consumers assign it.
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