Yeast vs. Mushrooms: A Note on Harberger's "A Vision of the Growth Process"

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From Industrial to Innovation Policy (2007, unknown): “In most technology growth models, these two nodes form the essential “dynamo effects” (Dosi 1988) or “yeast” and “mushroom” effects (Harberger 1998) implicit in the notion of technological change.”
Star Scientists, Innovation and Regional and National Immigration (2007, background): “…and similar economies, most economic growth is concentrated at any given time in a relatively few firms in a relatively few industries experiencing very large productivity gains or introducing new products of much greater value than their cost of production (Harberger 1998, Darby and Zucker 2003).”