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"“The main source of the productivity slowdown is not so much a slowing of innovation by the most globally advanced firms, but rather a slowing of the pace at which innovations spread out throughout the economy - a breakdown of the diffusion machine,” the OECD said.
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But why are innovations not spreading as quickly as before? One key reason appears to be that the process of “creative destruction” identified by Austrian economist Joseph Schumpeter as essential to capitalism’s dynamism appears to have lost some of its ferocity. In the OECD’s words, “market selection is weak.”
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One reason for that is government policy, which the OECD said favors incumbents across a whole range of areas, from regulations designed to protect the environment, to taxation. As a result, older firms that suffer from low productivity growth endure, often “trapping” workers in jobs for which they are over qualified.
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“High rates of skill mismatch often coincide with the presence of many small and old firms,” the OECD said. “These firms are often unproductive and tend to be harmful for aggregate productivity to the extent that they absorb valuable resources, thereby constraining the growth of more innovative firms.”

Trechos retirados de "OECD: Broken “Diffusion Machine” Is Slowing Productivity"