DOI: 10.7910/dvn/cxe9ug
title: Census of Concentration Ratios, 1947, 1954, 1958, 1970, 1972 (M278)

description: &lt;p&gt;There are five datasets in this collection.&lt;/p&gt;
&lt;p&gt;1947: contains concentration ratios and value of shipments for 454 4-digit census manufacturing industries. Each record is associated with a particular SIC. There is one record per industry.&lt;/p&gt;
&lt;p&gt;The source for the 1947 data is Study of Monopoly Power. hearings before the Subcommittee on Study of Monopoly Power of the Committee on the Judiciary, House of Representatives, Eighty-first Congress, first session, Serial No. 14, Part 2-B, Table 1. Washington, DC: U.S. Government Printing Office, 1950: 1437-1453.&lt;/p&gt;
&lt;p&gt;1954: contains concentration ratios and value of shipments for 447 4-digit census manufacturing industries. Each record is associated with a particular SIC. There is one record per industry.&lt;/p&gt;
&lt;p&gt; The source for the 1954 data is The Proportion of the Shipments (or Employees) of Each Industry, or the Shipments of each Group of Products Accounted for by the Largest Companies as Reported in the 1954 Census of Manufactures. Prepared at the request of the Subcommittee on Antitrust and Monopoly of the Senate Judiciary Committee. Washington, DC: U.S. Government Printing Office, July 1957. Table 6.&lt;/p&gt;
&lt;p&gt;1958: contains concentration ratios and value of shipments for 446 4-digit census manufacturing industries. Each record is associated with a particular SIC. There is one record per industry.&lt;/p&gt;
&lt;p&gt;The source for the 1958 data is Concentration Ratios in Manufacturing Industry, 1958, 87th Congress, second session, Committee print, Report prepared by the Bureau of the Census for the Subcommittee of Antitrust and Monopoly of the Committee on the Judiciary, Part 1. Washington, DC: U.S. Government Printing Office, 1962: Table 2.&lt;/p&gt;
&lt;p&gt;1970: contains 4-firm and 8 firm concentration ratios for 413 4-digit census manufacturing industries in 1970. Each record is uniquely associated with a particular SIC. There is one record per industry.&lt;/p&gt;
&lt;p&gt;The source for the 1970 data is the Annual Survey of Manufactures: 1970, Value of Shipment Concentration Ratios. M70(AS)-9, U.S. Government Printing Office: Washington, DC, 1972.&lt;/p&gt;
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