Key points are not available for this paper at this time.
T HE geographic extent of the market has long been recognized as an important element of industry structure. For lack of systematic and direct measures, however, previous studies have relied either on rough classifications of geographical market size (local, regional or national) (Comanor and Wilson, 1967, p. 433; Kaysen and Turner, 1959, appendixes, pp. 283-285; Stigler, 1963, pp. 265-269 and 56-57) or on output dispersion indexes such as the number of states needed to account for 75 per cent of total shipments (Collins and Preston, 1968, 1969; Fuchs, 1962). This paper develops an alternative index of market size based on the Census of Transportation. Some attempts are made to evaluate various measures of market extent by comparisons with indexes of output dispersion and with an element of transport cost. It ends with a brief summary of the geographic market sizes of United States manufacturing industries.
Leonard W. Weiss (Tue,) studied this question.