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α: calibrated so average coauthorship-adjusted count equals average raw count
Temporary price reductions or “sales” have become increasingly important in the evolution of the price level. We present a model of repeated price competition to illustrate how entry causes incumbents to alternate between high and low prices. Using a six‐year panel of weekly observations from a grocery chain, we find that individual stores employ more sales as the distance to Wal‐Mart falls. Moreover, the increase in the frequency of sales was concentrated on the most popular products, suggesting the use of a loss‐leader strategy.