Properties of Demand functions Comparative statics analysis(比较 静态分析) of ordinary demand functions the study of how ordinary demands x,*(p, p2y)and 2(p1,p2,y) change as prices p,, p and income y changeProperties of Demand Functions Comparative statics analysis （比较 静态分析）of ordinary demand functions -- the study of how ordinary demands x1 *(p1 ,p2 ,y) and x2 *(p1 ,p2 ,y) change as prices p1 , p2 and income y change