What follows is a list of the names of the industry categories used in this study to determine market shares and the weights used to define industry variables such as advertising intensity and concentration. The 1950 industry names are presented first. New SIC is the number Carl Schwinn assigned to the industry or industries listed to the right with their appropriate SIC (old SIC) numbers. These are followed by the 1972 industry list with the Weiss C4, where available. Where not available, we constructed a C4 from the census (national-level) figures.