The authors examine incumbent retailers’ reactions to a Wal-Mart entry and the impact of these
reactions on the retailers’ sales. They compile a unique dataset which represents a natural
experiment consisting of incumbent supermarket, drug, and mass stores in the vicinity of seven
Wal-Mart entries and control stores not exposed to the entries. The dataset includes weekly store
movement data for 46 product categories before and after each entry and allows them to measure
reactions and sales outcomes using a before-and-after-with-control-group analysis. They find
that, overall, incumbents suffer significant sales losses due to Wal-Mart entry, but there is
substantial variation across retail formats, stores, and categories both in incumbent reactions and
in their sales outcomes. Moreover, they find that a retailer’s sales outcomes are significantly
affected by its reactions, and the relationship between reactions and sales outcomes varies across
retail formats. These findings provide valuable insights on how retailers in different formats can
adjust their marketing mix to mitigate the impact of Wal-Mart entry.
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