This paper studies the existence of middle-income growth traps in a twoperiod overlapping generations model of economic growth with two types of labor and endogenous occupational choices. It also distinguishes between "basic" and "advanced" infrastructure, with the latter promoting design activities, and accounts for a knowledge network externality associated with product diversification. Multiple steady-state equilibria may emerge, one of them taking the form of a low-growth trap characterized by low productivity growth and a misallocation of talent-defined as a relatively low share of high-ability workers in design activities. Improved access to advanced infrastructure may help to escape from that trap. The implications of other public policies, including the protection of property rights and labor market reforms, are also discussed. JEL Classification Numbers: H54, O31, O41.

The Policy Research Working Paper Series disseminates the findings of work in progress to encourage the exchange of ideas about development issues. An objective of the series is to get the findings out quickly, even if the presentations are less than fully polished. The papers carry the names of the authors and should be cited accordingly. The findings, interpretations, and conclusions expressed in this paper are entirely those of the authors. They do not necessarily represent the views of the International Bank for Reconstruction and Development/World Bank and its affiliated organizations, or those of the Executive Directors of the World Bank or the governments they represent.

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The Policy Research Working Paper Series disseminates the findings of work in progress to encourage the exchange of ideas about development issues. An objective of the series is to get the findings out quickly, even if the presentations are less than fully polished. The papers carry the names of the authors and should be cited accordingly. The findings, interpretations, and conclusions expressed in this paper are entirely those of the authors. They do not necessarily represent the views of the International Bank for Reconstruction and Development/World Bank and its affiliated organizations, or those of the Executive Directors of the World Bank or the governments they represent.

The objective of this paper is to analyze the concept and determinants of "sovereign risk" and the role of the credit risk rating agencies which serve internationally as the main reference instruments employed by economic agents to assess this risk. The paper also tries to identify macroeconomic variables which could be associated with sovereign risk ratings awarded by rating agencies to each country. After examining the indicators on an individual basis, their potential as a group is tested econometrically as a determinant of the class of sovereign risk into which national economies fall. Our results constitute a set of indicators which emerging economies would be well advised to improve upon.