Market structure and foreign trade by Elhanan Helpman, Paul Krugman

By Elhanan Helpman, Paul Krugman

Market constitution and international alternate provides a coherent thought of alternate within the presence of marketplace constructions except excellent festival. the speculation it develops explains exchange styles, particularly of business international locations, and gives an integration among exchange and the function of establishment agencies. referring to present theoretical paintings to the most physique of alternate concept, Helpman and Krugman overview and restate recognized effects and in addition provide fullyyt new fabric on contestable markets, oligopolies, welfare, and multinational enterprises, and new insights on exterior economies, intermediate inputs, and alternate composition. Elhanan Helpman is Professor of Economics at Tel Aviv collage. Paul Krugman is Professor of Economics at MIT

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Thus, for example, the Ricardian theory relies on differences in the sectoral ranking of relative  < previous page < previous page 50 page_55 page_56 next page > next page > 51 Page 56 productivity levels, and the Heckscher-Ohlin theory relies on differences in the composition of factor endowments. Both theories build on constant returns to scale technologies. Despite this tradition it has also been recognized that increasing returns have an effect of their own on trade structure. This is explicitly discussed in Ohlin (1933, p.

Predictions of trade patterns that rely on autarky informationlike the use of autarky relative factor rewards in order to define relative factor abandanceare invalid, because in autarky production functions are effectively not the same due to the fact that the autarky external effects ξAj differ across countries. However, predictions that are based on post-trade informationlike the Vanek (1968) factor-content prediction in the presence of factor price equalization and identical homothetic preferences or the Helpman (1984b) factor-content prediction in the absence of factor price equalizationremain valid.

This can be seen most clearly in the case of the country- and industry-specific output-generated external effects that have occupied most of the literature (see Helpman 1984a). Take the special separable form that has been often used: where is increasing, strictly quasi concave, and positively linear homogeneous. The function has an elasticity that is smaller than one. If is an increasing function of Xi, there are economies of scale, and if it is a decreasing function, there are diseconomies of scale.

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