电力花了几十年才成为可交易商品。
It took decades for electrical power to become a tradable commodity.
可交易商品可以被购买或出售而用于管理CO2排放。
The tradable commodity can be purchased or sold for use in managing CO2 emissions.
不过，购买力平价仅适用于便于跨境交换的可交易商品，比如大宗商品或电子产品。
But PPP only applies to tradable goods that are easily exchanged across borders, like commodities or electronics.
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