Posts; Likes; Following; Archive; ipsnews.net. Join Facebook to connect with David Bell and others you may know. Bell, David R. (2014), Location Is (Still) Everything: The Surprising Influence of the Real World on How We Search, Shop, and Sell in the Virtual One; Bell, David and Sangyoung Song (2007), Neighborhood Effects and Trial on the Internet: Evidence from Online Grocery Retailing, Quantitative Marketing and Economics, 5 … Leonard M. Lodish is the Samuel R. Harrell Professor of Marketing at the Wharton School. Course Outcomes. David R. Bell, an authority on consumer behavior and e-commerce, explains why. A graduate of Stanford University and marketing professor at the University of Pennsylvania’s Wharton School, David is an award-winning teacher. According to the most recent US Census e-commerce reports, about $5.5 trillion changes hands online versus about $19 trillion o