“…Our finding that online display advertising is a substitute for offline display (primarily billboard) advertising contributes to a growing literature in marketing that explores the relationship between offline and online environments for customer acquisition (Bell and Choi, 2009), brands (Danaher et al, 2003), word of mouth (Bell and Song, 2007;Forman et al, 2008), purchases (Forman et al, 2009;Brynjolfsson et al, 2009), customized promotions (Zhang and Wedel, 2009), ad pricing (Goldfarb and Tucker, 2009), search behavior (Lambert and Pregibon, 2008) and price sensitivity (Chu et al, 2008). We believe ours is the first study to empirically investigate consumer substitution between online and offline advertising.…”