Scarcity,law of稀缺规律
大部分人所需要的东西只能得到有限的供应[免费品(free goods)例外]的原理。因此商品一般是稀缺的,必须通过价格或者其他形式进行某种程度的配给。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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