The evolving role of hit and niche products in brick-and-mortar retail category assortment planning: A large-scale empirical investigation of U.S. consumer packaged goods

+ β 2 Y e a r t + β 3 S a l e s R a n k i t * Y e a r t + β 4 G r o c e r y i t + β 5 P r i c e i t + β 6 F e a t u r e i t + β 7 D i s p l a y i t + α 1 : 31 C a t e g o r y c + ε i t The empirical results (see Table 4 ) strongly support the model free evidence as there are positive and highly significant (p < .001) interaction effects between sales rank and year in all three model specifications.

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