Abstract
This paper considers the strategic (in)attention of multi-product firms with endogenous product range choice and introduces free entry prior to firms' strategic choices on attention or inattention. We find that within-firm cannibalization of multi-product firms plays a key role in determining firms' strategic behavior. Furthermore, with free entry, we identify a single threshold that determines whether all the entrants are attentive or inattentive, and hence the market structure is unique almost everywhere.
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