Published online by Cambridge University Press: 10 May 2017
The practice of econometrics entails choosing which equations to include in a system, and which equations to inclue in a system, and what restrictions to impose on the parameters. There is a widespread, but not universally held, preference for making these choices on the basis of theory. Until recently, this theory has rested on the hypothesis that agents solve static optimization problems. For agents’ behavior to be consistent with this story, certain restrictions must hold. These restrictions are used in econometric models as maintained or testable hypotheses.