Contains household level purchase histories Variables: id household identifier date date of purchase vol purchased volume in ounces brand brand number The data we use are based on the so-called ERIM database, which is collected by A.C.Nielsen. The data span the years 1986 to 1988, and the particular subset we use concerns purchases of detergent by households in Sioux Falls (South Dakota, USA). For our purposes, the data are aggregated to the brand level. Brand coding: 1=Cheer 2=Oxidol 3=Surf 4=Tide 5=Wisk 6=Rest

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