• Publications
  • Influence
Innovation and growth in the global economy
Traditional growth theory emphasizes the incentives for capital accumulation rather than technological progress. Innovation is treated as an exogenous process or a by-product of investment in
Estimating Trade Flows: Trading Partners and Trading Volumes
We develop a simple model of international trade with heterogeneous firms that is consistent with a number of stylized features of the data. In particular, the model predicts positive as well as zero
Export Versus FDI with Heterogeneous Firms
Multinational sales have grown at high rates over the last two decades, outpacing the remarkable expansion of trade in manufactures. Consequently, the trade literature has sought to incorporate the
Quality Ladders in the Theory of Growth
We develop a model of repeated product improvements in a continuum of sectors. Each product follows a stochastic progression up a quality ladder. Progress is not uniform across sectors, so an
Global Sourcing
We present a North-South model of international trade in which differentiated products are developed in the North. Sectors are populated by final-good producers who differ in productivity levels.
A Simple Theory of International Trade with Multinational Corporations
  • E. Helpman
  • Economics
    Journal of Political Economy
  • 1 June 1984
Using the idea that firm-specific assets associated with marketing, management, and product-specific R & D can be used to service production plants in countries other than the country in which these
Protection for Sale
We develop a model in which special interest groups make political contributions in order to influence an incumbent government's choice of trade policy. In the political equilibrium. the interest
Innovation, Imitation, and Intellectual Property Rights
The debate between the North and the South about the enforcement of intellectual property rights in the South is examined within a dynamic general equilibrium framework in which the North innovates
Trade, FDI, and the Organization of Firms
New developments in the world economy have triggered research designed to better understand the changes in trade and investment patterns, and the reorganization of production across national borders.