Phone-Wielding Shoppers Strike Fear Into Retailers

Until recently, retailers could reasonably assume that if they just lured shoppers to stores with enticing specials, the customers could be coaxed into buying more profitable stuff, too. Now, marketers must contend with shoppers who can use their smartphones inside stores to check whether the specials are really so special, and if the rest of the merchandise is reasonably priced.

"The retailer's advantage has been eroded," says Greg Girard of consultancy IDC Retail Insights, which recently found that roughly 45% of customers with smartphones had used them to perform due diligence on a store's prices. "The four walls of the store have become porous." Some of the most vulnerable merchants: sellers of branded, big-ticket items like electronics and appliances, which often prompt buyers to comparison shop. Best Buy, the nation's largest electronics chain, said Tuesday that it may lose market share this year, a downward trend that some analysts are attributing in part to pressure from price comparison apps.