Abstract
Over the past few years, considerable effort has been devoted to the construction of concentration ratios which cover broader (twoand three-digit) sectors of American industry than those which are prepared by the Bureau of the Census. Those who have attempted to develop such sector concentration measures have done so by aggregating four-digit industry concentration ratios to either a two-digit level, as Levinson (1960) and Weiss (1963) have done, or to a three-digit level, as Miller (1967), Kilpatrick (1968) and others have, rather than to try to compute such concentration data directly.1 One purpose of constructing such average concentration ratios is, of course, to facilitate direct comparisons between the level of concentration and rate of profit at as comparable and detailed industry level as possible. Concentration figures computed from Census of Manufactures (1970, 1971) data are available for only four-digit industries and five-digit product classes;2 unfortunately, actual profit data are available only on a
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