Promotional Data: Information about feature advertising in weekly newspaper fliers is provided by IRI's Infoscan, which provides an estimate of all commodity volume of a particular UPC that received feature advertisement. IRI collects this data based on a representative sample of approximately 60 stores from throughout the Chicago metropolitan area. The information provided was at an aggregate level for the Dominick's chain and for all other competitors. The aggregation of the competitor information reduces its value for our purposes and is not used. In-store promotion is measured using a deal code provided in DFF's store-level scanner database. The deal-code is a dummy variable which shows whether there was a bonus-buy sticker on the shelf or an in-store coupon. Since these promotional variables are at the UPC level, we create indices of the feature and deal variables for each aggregate similarly to that of price.

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