The above utility function also has the property of diminishing marginal utility for each commodity.
上面的效用函数也有每种商品边际效用递减的性质。
Futures contracts are legally binding agreements and are standardized according to the quality, quantity, delivery time, and location for each commodity.
期货合约是受法律约束的，在质量、数量、交割时间及每一具体商品的交割地点上都有标准化协议。
For each commodity, your program should output the name of the commodity and the lowest, the average and the highest prices of successful deals in one line.
对于每个日用品，你的程序要在一行内输出：成功交易的商品名、最低价、平均价和最高价。
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