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This Chapter of the Handbook will present a discussion of models, parcicularly models used in econometrics. models play a major role in all econometric studies, whether theoretical or applied. Indeed, defining econometrics as the branch of economics. | Chapter 3 ECONOMIC AND ECONOMETRIC MODELS MICHAEL D. INTRILIGATOR University of California Los Angeles Contents 1. Introduction and overview 182 2. Models and economic models 182 3. Comparative statics 186 4. Econometric models 187 . Structural form 190 . Reduced form 193 . Final form 195 5. Identification 197 6. Some specific models 199 . Demand models 199 . Production models 202 . Macroeconometric models 204 . Other econometric models 206 7. Uses of econometric models 207 . Structural analysis 208 . Forecasting 209 . Policy evaluation 212 8. Conclusion 215 References 216 The author acknowledges with appreciation the helpful suggestions of Ray Fair Gary Fromm Zvi Griliches Elizabeth Landaw and Henri Theil. Handbook of Econometrics Volume I Edited by Z. Griliches and . Intriligator North-Holland Publishing Company 1983 182 M. D. Intriligator 1. Introduction and overview This chapter of the Handbook will present a discussion of models particularly models used in Models play a major role in all econometric studies whether theoretical or applied. Indeed defining econometrics as the branch of economics concerned with the empirical estimation of economic relationships models together with data represent the basic ingredients of any econometric study. Typically the theory of the phenomena under investigation is developed into a model which is further refined into an econometric model. This model is then estimated on the basis of data pertaining to the phenomena under investigation using econometric techniques. The estimated model can then be used for various purposes including structural analysis forecasting and policy evaluation. This chapter provides a discussion of models and economic models in Section 2 and comparative statics in Section 3. Section 4 then presents econometric models including the structural form reduced form and final form. The problem of identification which is presented in more detail in Chapter 4 of

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