“…Early work modeled MBGs as a bundled, homogenous risk-reducing mechanism that increased demand (Mann & Wissinik, 1988, 1990Welling, 1991;Geistfeld & Key, 1991;Phillips, 1993;Davis, Gerstner & Hagerty, 1995) or as a signal for quality of either the product (Heal, 1977) or the retailer (Moorthy & Srinivasan, 1995). These studies treated MBGs as a single, well-defined product, ignoring variations in consumer product evaluation and uncertainty and market evidence showing that companies offer differentiated MBGs.…”