Cost reduction, entry, and the interdependence of market structure and economic growth.

Thumbnail Image




Peretto, PF

Journal Title

Journal ISSN

Volume Title


I study the joint determination of market structure and growth in an oligopolistic economy. Firms run in-house R&D programs to produce over time a continuous flow of cost-reducing innovations. In symmetric equilibrium, the relation between market structure and growth has two aspects. First, a larger number of firms induces fragmentation of the market and dispersion of R&D resources. This prevents exploitation of scale economies internal to the firm and slows down growth. Second, the number of firms changes with market and technology conditions and is endogenous. In particular, R&D spending is a fixed cost and there is a negative feed-back of the rate of growth on the number of firms. The explicit consideration of the interdependence of market structure and growth identifies a fundamental trade-off between growth and variety that produces interesting results. For example, the scale effect is bounded from above and converges to zero when the number of firms is large. Moreover, the market grows too little and supplies too much variety. The inefficiency is not due to technological externalities but to oligopolistic pricing and the interaction between R&D and entry decisions. [ABSTRACT FROM AUTHOR]








Pietro F. Peretto

Professor of Economics

Peretto is a macroeconomist who studies the sources and effects of technological change mainly using endogenous growth theory. With this focus, he has studied international trade, growth and innovation, market structure, corporate taxation, industrial organization, development and the environment, R&D, demography, and more. He has been publishing his research for nearly three decades and has had his work appear in books and leading academic journals. He is Associate Editor of the Journal of Economic Growth.

Unless otherwise indicated, scholarly articles published by Duke faculty members are made available here with a CC-BY-NC (Creative Commons Attribution Non-Commercial) license, as enabled by the Duke Open Access Policy. If you wish to use the materials in ways not already permitted under CC-BY-NC, please consult the copyright owner. Other materials are made available here through the author’s grant of a non-exclusive license to make their work openly accessible.