The data employed in this study and the methods used to analyze them are discussed in the next Section. As that discussion attempts to indicate, my orientation here is exploratory and descriptive. I attempt to draw a rough map of some unexplored territory, in part to see if it might be interesting for others to return, not to do definitive cartography or to test structural hypotheses.

The results obtained are reported in Sections 3 and 4. The suggest that further exploration of this territory would indeed be worthwhile. Section 3 summarizes the annual estimates of the average profitability advantage of large firms. These estimates provide strong evidence that intra-industry profitability relations have in fact changed systematically.

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