Gisser, Misch; McClure, James; Ökten, Giray; Santoni, Gary (2009). «Some Anomalies Arising from Bandwagons that Impart Upward Sloping Segments to Market Demand». Econ Journal Watch. 6 (1): 21–34. «In Gary Becker's (1991) theory of bandwagon effects, a portion of market demand is positively sloped. In this, he ignores Harvey Leibenstein's (1950) hypothesis that market demands for bandwagon goods are everywhere negatively sloped (stemming from scarcity imposed constraints). A substantial literature now invokes Becker's bandwagon, also ignoring Leibenstein.»