We analyze recent contributions to growth theory based on the model of expanding variety of Romer [Romer, P. (1990). "Endogenous technological change". Journal of Political Economy 98, 71-102]. In the first part, we present different versions of the benchmark linear model with imperfect competition. These include the "lab-equipment" model, "labor-for-intermediates" and "directed technical change". We review applications of the expanding variety framework to the analysis of international technology diffusion, trade, cross-country productivity differences, financial development and fluctuations. In many such applications, a key role is played by complementarities in the process of innovation.
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ReDIF This chapter was published in: Philippe Aghion & Steven Durlauf (ed.) Handbook of Economic Growth, , chapter 03, pages 111-170, 2005.
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This chapter was published in the following book, which is listed on IDEAS: Philippe Aghion & Steven Durlauf (ed.), 2005.
"Handbook of Economic Growth,"
Handbook of Economic Growth,
Elsevier,
edition 1, volume 1, number 1.
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