ABSTRACT
Between the macro-economic problems and those of pricing and competition, there are a range of problems for which concentration data have value. Concentration data has relevance to a much wider field than that covered by the economic and the political alone and should be developed in many forms. The relative decline of agriculture contributed to the increase in concentration but surely a part was contributed by railroad consolidation and the trust movement in manufacturing. The micro-index can reflect a change in intra-industry concentration but it could not possibly reflect a change in inter-industry concentration. If one makes the comparison on the basis not of total assets which involve a considerable amount of double counting, but on the basis of tangible assets which involve no double counting, there is a slight rise in concentration indicated. The National Resources Committee provided fixtures on concentration for 1929 and 1933 which are generally regarded as reliable.
