投资者还担心有可能出现通货紧缩，也就是商品、服务的总体价格水平下降，因而对大宗商品就更加谨慎了。
Adding to investor wariness about commodities are concerns about the possibility of deflation, or a decline in the general level of prices for goods and services.
当总体价格水平上涨时，单位货币所能够买到的商品和服务就会减少，也就是说，单位货币的购买力下降了。
When the general price level rises, each unit of currency buys fewer goods and services, which means the purchasing power of each unit of money is reduced.
当总体价格水平上涨时，单位货币所能够买到的商品和服务就会减少，也就是说，单位货币的购买力下降了。
When the general price level rises, each unit of currency buys fewer goods and services, which means the purchasing power of each unit of money is reduced.
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