“…However, they do not allow the number of industries or the frontier technology of each industry to increase over time. As a result, groups never break up in Parente and Prescott (1999), and so never 2 Olson (1982), Mokyr (1990), and Parente and Prescott (2000) all argue that differences in the prevalence of special interest groups across time and across countries account for the evolution of international income differences. 3 Dinopoulos and Syropoulos (2001), for example, examine how the costs of rent-seeking affects the incentives of monopoly producers to increase the cost of innovation in a quality ladder model of development with a fixed number of industries.…”