Paul Geroski has established two stylized facts with respect to the prevalence of differential changes (mobility) of indicators of economic and technological performance: technological indicators show a larger amount of mobility than do economic indicators. We assess the two stylized facts for a sample of 392 large German firms observed over the period 1981--1993 and assigned to eleven manufacturing industries. We analyze these data with two novel methods, Salter curves and mobility indices based on fractile Markov chains. Our analysis supports Geroski's two stylized facts in the case of large German manufacturing firms taking account of sectoral differences.
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