一、问题的提出十九世纪中叶,德国著名统计学家恩斯特·恩柏尔在消费结构的变化研究方面提出这样的定律:一个家庭收入越少,家庭收入中或家庭总支出中用于买食物的支出所占比例就越大;随着家庭收入的增加,家庭收入中或家庭支出中用来购买食品的支出将会下降。这就是“恩格尔定律”。恩格尔系数是指上述定律得出的用于食物的支出与总支出的比例数。据恩格 First, the problem raised The mid-nineteenth century, the famous German statistician Ernst · Emberl in the study of changes in the structure of consumption proposed the law: the less a family income, family income or total household expenditure for The greater the proportion of spending on food, the lower the expenditure on household income or family expenses to buy food as household incomes rise. This is “Engel’s Law.” The Engel’s Coefficient is the ratio of expenditure on food and total expenditure derived from the above law. According to Enge