Are There “Natural” Market Structures?
研究发现，在狭义产品市场中，市场份额分布遵循半对数分布模式，这种模式在广泛行业和整体经济中普遍存在，暗示其可能是一种“自然”现象。文章探讨了导致规模分布不均的增长过程，并利用PIMS数据检验了企业增长与规模关系的两个关键假设。
This article shows that distributions of market shares in narrowly-defined product markets follow the same general pattern found in earlier studies of broad “industries” and in the economy as a whole. Typically, the structure of a market conforms to the semi-logarithmic distribution; this pattern is so pervasive as to suggest that it is a “natural” phenomenon. The nature of growth processes that lead to unequal distributions of size is explored, and evidence from the PIMS data base is used to test two key assumptions about business growth and its relationship to size.