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 exogenous variables well explains rural and urban consumption .
前定变量