该假设表明μ与X不存在任何形式的相关性，因此该假设成立时也往往称X为外生解释变量（exogenous explanatory variable），否则称X为内生解释变量（endogenous explanatory variable）。
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外生变量是模型本身不予以解释而是当成已知的变量。
An exogenous variable is a variable that is not explained by the model but rather is taken as given.
新古典增长理论将技术进步看作外生变量，无法全面解释经济增长的动因。
Neoclassic economy growth theory regards technology advancement as exogenous variable, fails to explain comprehensively the cause of economy growth.
通过模型对市场波动进行实证研究表明：以当期收入、价格、上期储蓄为外生变量、前定变量的全国消费品零售量模型较好地解释了农村、城市的消费。
An empirical study based on the model indicates the following result: the three-equation model which consists of current income, price, and saving of last year as ex...
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