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Title: Imposing Curvature Conditions on Flexible Functional Forms to GNP Functions
Authors: Chapda Nana, Guy
Larue, Bruno
Authors (Email): Larue, Bruno (
Keywords: GNP function
flexible functional forms
curvature violations
JEL Codes: D24
Issue Date: 2012-05
Series/Report no.: CREATE Working paper
Abstract: This paper empirically investigates the implications of the imposition of convexity in output prices and concavity in factor endowments on flexible functional forms for the GNP function. Using macroeconomic data for Switzerland, we estimate the Translog and the Symmetric Normalized Quadratic forms to investigate the manner with which curvature restrictions are imposed, the extend of curvature violations and the robustness of estimated elasticities. We also compare the predictive accuracy of the aforementioned flexible functional forms. Our result show that concavity in factor endowments is violated much more often than convexity in output prices. For the Translog, the date at which local restrictions are imposed matters a great deal in terms of remaining curvature violations in the sample, but far less for estimated elasticities. In contrast, we found that the size and sign of elasticities vary across functional forms. In-sample forecasting analysis demonstrates that the Translog model significantly dominates the Symmetric Normalized Quadratic.
Institution/Association: University of Laval>Center for Research on the Economics of the Environment, Agri-food, Transports and Energy (CREATE)>Working Papers
Collections:Working Papers

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