Collective Bias Expands Footprint as Shopper Marketing Demand Grows by Amanda Hoelzeman Posted 12/7/2012 08:44 am Updated 2 years ago Firm's revenue has nearly quadrupled since 2010. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access stories older than 20 days. Purchase Now Already have archive access? Login to view this article.