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Do firms' product lines include too many varieties, and do shops open too many days?
Klemperer, Paul, (1993)
Do Firms' Product Lines Include Too Many Varieties?
Klemperer, Paul, (2000)
Kundenorientierte Sortimentsgestaltung als Herausforderung für das Controlling im Einzelhandel mit Lebensmitteln
Schröder, Hendrik, (2000)
Consumer switching costs : a survey
Padilla, Atilano Jorge, (1991)