Growth and Cycles
Extends the Schumpeterian framework by introducing endogenous market structure through technology imitation. Rather than assuming creative destruction leads to monopoly replacement, the model allows incumbents to engage in 'imitation effort' to copy radical innovations and remain competitive. This modification creates more realistic firm survival dynamics and explores how market concentration affects innovation incentives. The framework bridges standard growth models with more flexible market structures where both innovation and imitation drive technological progress.
Key Findings
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Incumbents can survive through imitation: Unlike standard Schumpeterian models where entrants replace incumbents, successful imitation allows established firms to remain competitive alongside innovators
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Endogenous market structure emerges: The number of firms per sector becomes endogenous, determined by the relative success of innovation versus imitation efforts
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Extended firm lifetimes: Both innovation and imitation mechanisms create longer average firm survival compared to pure creative destruction models
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Modified Arrow replacement effect: When incumbents can imitate rather than being displaced, the traditional replacement effect may not hold, allowing both entrants and incumbents to invest in technological progress
Methodology
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Extended quality ladder model: Builds on standard Schumpeterian growth framework but allows multiple firms per sector through successful imitation
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Dual innovation processes: Entrants engage in radical innovation while incumbents can attempt to copy new technologies through imitation effort
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Endogenous firm dynamics: Market structure evolves based on success rates of innovation and imitation, creating realistic industry concentration patterns
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Competitive equilibrium with multiple firms: When imitation succeeds, profits are shared among the original innovator and successful imitators
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Dynamic general equilibrium: Integrates innovation and imitation decisions with standard RBC framework for business cycle analysis
Implications
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Competition policy: Regulators must distinguish between concentration arising from superior innovation versus that resulting from legitimate imitation and learning
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Innovation incentives: Both breakthrough innovation and rapid imitation contribute to technological progress and economic growth
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Industry evolution: Model explains realistic patterns of firm turnover and market concentration across different sectors
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Firm strategy: Companies face strategic choices between pioneering new technologies versus quickly adopting and improving existing innovations
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Growth theory: Technological progress stems from both creative destruction and incremental improvements through competitive imitation