Neighborhood effects and trial on the Internet: Evidence from online grocery retailing

For traditional retailers the customer pool is largely bounded in space, whereas an Internet retailer can obtain customers from a wide geographical area. We examine customer trials at Netgrocer.com, and drawing on studies in marketing and economics conjecture that exposure spatially to proximate others (through direct social interaction or observation), can influence decisions of those who have yet to try. Trials arise from utility-maximizing behavior and the model is estimated as a discrete time hazard. The data span: (1) 29,701 residential zip codes, (2) 45 months of transactions since inception, and (3) zip code contiguity relationships. The estimated neighborhood effect is significantly positive and economically meaningful.