Effects of Patent Policy on Income and Consumption Inequality in an R&D-Growth Model

Chu, Angus C. (2008): Effects of Patent Policy on Income and Consumption Inequality in an R&D-Growth Model.

Abstract

What are the effects of strengthening patent protection on income and consumption inequality? To analyze this question, this paper incorporates heterogeneity in the initial wealth of households into a canonical quality-ladder growth model with endogenous labor supply. In this model, I firstly show that the aggregate economy always jumps immediately to a unique and stable balanced-growth path. Given the balanced-growth behavior of the aggregate economy and an exogenous distribution of initial wealth, I then show that the endogenous distribution of assets in subsequent periods is stationary and equal to its initial distribution. The model predicts that strengthening patent protection increases (a) economic growth by stimulating R&D investment and (b) income inequality by raising the return on assets. However, whether it also increases consumption inequality depends on the elasticity of intertemporal substitution. If and only if this elasticity is less (greater) than unity, strengthening patent protection increases (decreases) consumption inequality. For standard parameter values, strengthening patent protection leads to a larger increase in income inequality than consumption inequality.

• Item Type: MPRA Paper
• Language: English
• Keywords: endogenous growth; heterogeneity; income inequality; patent policy
• Subjects: D - Microeconomics > D3 - Distribution > D31 - Personal Income, Wealth, and Their Distributions; O - Economic Development, Innovation, Technological Change, and Growth > O4 - Economic Growth and Aggregate Productivity > O41 - One, Two, and Multisector Growth Models; O - Economic Development, Innovation, Technological Change, and Growth > O3 - Innovation ; Research and Development ; Technological Change ; Intellectual Property Rights > O34 - Intellectual Property and Intellectual Capital

References

Acemoglu, Daron; and Akcigit, Ufuk “State Dependent Intellectual Property Rights Policy” NBER Working Paper No. 12775.

Aghion, Phillippe; Caroli, Eve; and Garcia-Penalosa, Cecilia (1999) “Inequality and Economic Growth: The Perspective of the New Growth Theories” Journal of Economic Literature, vol. 37, p. 1615-1660.

Aghion, Phillippe; and Howitt, Peter (1992) “A Model of Growth through Creative Destruction” Econometrica, vol. 60, p. 323-351.

Caballero, Ricardo J.; and Jaffe, Adam B. (2002) “How High Are the Giants’ Shoulders: An Empirical Assessment of Knowledge Spillovers and Creative Destruction in a Model of Economic Growth” in A.B. Jaffe and M. Trajtenberg, eds., Patents, Citations and Innovations: A Window on the Knowledge Economy, p. 89-152.

Chou, Chien-Fu; and Talmain, Gabriel (1996) “Redistribution and Growth: Pareto Improvements” Journal of Economic Growth, vol. 1, p. 505-523.

Foellmi, Reto; and Zweimuller, Josef (2006) “Income Distribution and Demand-Induced Innovations” Review of Economic Studies, vol. 73, p. 941-960.

Gallini, Nancy T. (2002) “The Economics of Patents: Lessons from Recent U.S. Patent Reform” Journal of Economic Perspectives, vol. 16, p. 131-154.

Garcia-Penalosa, Cecilia; and Turnovsky, Stephen J. (2006) “Growth and Income Inequality: A Canonical Model” Economic Theory, vol. 28, p. 25-49.

Grossman, Gene M.; and Helpman, Elhanan (1991) “Quality Ladders in the Theory of Growth” Review of Economic Studies, vol. 58, p. 43-61.

Hatipoglu, Ozan (2008) “Patents, Inequality and Innovation-Driven Growth” Bosphorus University Working Paper.

Jaffe, Adam B. (2000) “The U.S. Patent System in Transition: Policy Innovation and the Innovation Process” Research Policy, vol. 29, p. 531-557.

Jaffe, Adam B.; and Lerner, Josh (2004) “Innovation and Its Discontents: How Our Broken System Is Endangering Innovation and Progress, and What to Do About It” Princeton University Press.

Jones, Charles I. (1999) “Growth: With or Without Scale Effects” American Economic Review Papers and Proceedings, vol. 89, p. 139-144.

Jones, Charles I.; and Williams, John C. (1998) “Measuring the Social Return to R&D” Quarterly Journal of Economics, vol. 113, p. 1119-1135.

Jones, Charles I.; and Williams, John C. (2000) “Too Much of a Good Thing? The Economics of Investment in R&D” Journal of Economic Growth, vol. 5, p. 65-85.

Krueger, Dirk; and Perri, Fabrizio (2006) “Does Income Inequality Lead to Consumption Inequality? Evidence and Theory” Review of Economic Studies, vol. 73, p. 163-193.

Lanjouw, Jean Olson (1998) “Patent Protection in the Shadow of Infringement: Simulation Estimations of Patent Value” Review of Economic Studies, vol. 65, p. 671-710.

Li, Chol-Won (1998) “Inequality and Growth: A Schumpeterian Perspective” University of Glasgow Working Papers 9609.

Li, Chol-Won (2001) “On the Polity Implications of Endogenous Technological Progress” Economic Journal, vol. 111, p. C164-C179.

O’Donoghue, Ted; and Zweimuller, Josef (2004) “Patents in a Model of Endogenous Growth” Journal of Economic Growth, vol. 9, p. 81-123.

Zweimuller, Josef (2000) “Schumpeterian Entrepreneurs Meet Engel’s Law: The Impact of Inequality on Innovation-Driven Growth” Journal of Economic Growth, vol. 5, p. 185-206.