Additional Note: Mobile ad spending historical data up to 2015 is derived from Interactive Advertising Bureau (IAB)/PricewaterhouseCoopers (PwC) data. Retail includes mail order/catalog, restaurants/fast food, drug stores, retail stores, cosmetics stores, and merchants of apparel, home furnishings/textiles, toys, pet food/supplies, appliances, jewelry and general merchandise.
Methodology: Estimates are based on the analysis of various elements related to the ad spending market, including macro-level economic conditions; historical trends of the advertising market; historical trends of each medium in relation to other media; reported revenues from major ad publishers; estimates from other research firms; data from benchmark sources; consumer media consumption trends; consumer device usage trends; and eMarketer interviews with executives at ad agencies, brands, media publishers and other industry leaders.