Analysis of the Marshallian and Schumpeterian microfoundations of endogenous innovation enables us to draw a line between the new emerging evolutionary complexity from biological evolutionary analysis and to overcome its limits. This chapter integrates the Marshallian process of imitation and selection with the Schumpeterian creative response. In Marshall initial variety is given and exogenous, the dynamics of the process is driven by the selective diffusion of best practice and long-term equilibrium stops the generation of externalities; firms are not expected to try to react to unexpected mismatches between planned and actual product and factor market conditions. In Schumpeter firms are allowed to try to react, and the quality of knowledge externalities supports their creative response and may keep the system in a self-sustained process of growth. The Schumpeterian creative response can be regarded as a special case of the Marshallian dynamics that takes place when externalities – available to all firms, including best-performing ones – enable the introduction of innovations that account for the reproduction of superior performance and variety. The levels of reactivity of agents and of quality of knowledge externalities, provided by the system, account for output and productivity growth. This hypothesis is tested by means of an agent-based simulation model that shows how these microfoundations of endogenous innovation are able to generate aggregate dynamics based upon the interaction between individual decision-making and system properties.
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