Abstract
performance. Two books that epitomize confidence in such findings for the food manufacturing and grocery distribution industries are Connor et al. and Marion et al. Surveying the academic literature published up to the early 1980s (and employing data sets that spanned the 1950s to 1970s), these authors judged that large company market shares; economies of scale, size, and scope; and product differentiation, whether rooted in the structures of markets or endogenously spawned rivalry; had significant and nontransitory negative effects on competitive performance. Mergers, technical barriers to entry, and effective product differentiation in turn fed back on markets to raise con-
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