1.2 WHY STUDY ECONOMETRICS? 92. Mathematical economics and econometrics (1) Mathematical economics express economic theory in mathematical form or equations without regard to measurability or empirical verification of the theory (2) Econometrics empirical verification of economic theory. That iS: uses mathematical models proposed by the mathematical economist to do empirical testing1.2 WHY STUDY ECONOMETRICS? 2.Mathematical economics and Econometrics （1） Mathematical economics express economic theory in mathematical form or equations without regard to measurability or empirical verification of the theory. （2） Econometrics empirical verification of economic theory. That is: uses mathematical models proposed by the mathematical economist to do empirical testing