How Reasonable Are Assumptions Used in Theoretical Models?: Computational Evidence on the Likelihood of Trade Pattern Changes
This paper seeks to contribute to discussion of the reasonableness of sometimes seemingly innocent assumptions used in theoretical trade models that the direction of trade is both predetermined for each good for each country and fixed. Here, we provide computational evidence as to the reasonableness of this assumption. We consider a simple three-country, three-good, pure-exchange model with CES preferences. We compute free trade competitive equilibria, three-country non-cooperative Nash equilibria, and customs union equilibria for randomized parameterizations, and find that trade patterns change in around 35% of the cases between free trade and customs union equilibria. In three-country Nash and customs unions comparisons trade patterns change roughly 40% of the time. We evaluate alternative cases, including with different numbers of randomizations in the parameter space. Results remain robust, reinforcing our conclusion that the assumption of unchanged trade pattern changes, common in theoretical analysis, does not have firm numerical support in the cases we consider.
|Date of creation:||Mar 2001|
|Publication status:||published as Abrego, Lisandro, Raymond Riezman and John Whalley. “How Reasonable are Assumptions Used in Theoretical Models? Computational Evidence on the Likelihood of Trade Pattern Changes." Canadian Journal of Economics 39, 3 (August 2006): 781-789.|
|Contact details of provider:|| Postal: National Bureau of Economic Research, 1050 Massachusetts Avenue Cambridge, MA 02138, U.S.A.|
Web page: http://www.nber.org
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- Raymond RIEZMAN, 2013.
"Customs Unions and the Core,"
World Scientific Book Chapters,
in: International Trade Agreements and Political Economy, chapter 3, pages 33-43
World Scientific Publishing Co. Pte. Ltd..
- Riezman, Raymond, 1985. "Customs unions and the core," Journal of International Economics, Elsevier, vol. 19(3-4), pages 355-365, November.
- John Kennan & Raymond Riezman, 2013. "Optimal Tariff Equilibria with Customs Unions," World Scientific Book Chapters, in: International Trade Agreements and Political Economy, chapter 5, pages 53-66 World Scientific Publishing Co. Pte. Ltd..
- John Kennan & Raymond Riezman, 1990. "Optimal Tariff Equilibria with Customs Unions," Canadian Journal of Economics, Canadian Economics Association, vol. 23(1), pages 70-83, February.
- Syropoulos, Constantinos, 1999. "Customs Unions and Comparative Advantage," Oxford Economic Papers, Oxford University Press, vol. 51(2), pages 239-266, April.
- Berglas, Eitan, 1979. "Preferential Trading Theory: The n Commodity Case," Journal of Political Economy, University of Chicago Press, vol. 87(2), pages 315-331, April.
- Kehoe, Timothy J, 1980. "An Index Theorem for General Equilibrium Models with Production," Econometrica, Econometric Society, vol. 48(5), pages 1211-1232, July.
- Timothy J. Kehoe, 1979. "An Index Theorem for General Equilibrium Models with Production," Cowles Foundation Discussion Papers 516, Cowles Foundation for Research in Economics, Yale University.
- John Kennan & Raymond Riezman, 2013. "Do Big Countries Win Tariff Wars?," World Scientific Book Chapters, in: International Trade Agreements and Political Economy, chapter 4, pages 45-51 World Scientific Publishing Co. Pte. Ltd..
- Kennan, John & Riezman, Raymond, 1988. "Do Big Countries Win Tariff Wars?," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 29(1), pages 81-85, February.