According to Foursquare Labs, which compiled location information from shoppers' mobile devices during the first two days after Amazon completed its acquisition of Whole Foods and compared the data with the same period a week earlier, the electronic commerce company boosted customer traffic to Whole Foods by 25 percent. Bloomberg reports: Amazon acquired the upscale chain last month for $13.7 billion, a move that has brought turmoil to the supermarket industry and sent shares of grocery rivals tumbling. The same day it completed the acquisition, the e-commerce giant cut prices by as much as 43 percent on a range of items. Organic fuji apples were marked down to $1.99 a pound from $3.49 a pound, for instance. Organic avocados dropped to $1.99 each from $2.79. The traffic data is an optimistic sign that Amazon can succeed in the brick-and-mortar world. In some areas, the jump in customers was dramatic. At stores in Chicago, 35 percent more shoppers visited Whole Foods stores, Foursquare found. It's not surprising that curious shoppers visited the stores immediately after the takeover, particularly after a bevy of media coverage, according to Jennifer Bartashus, an analyst at Bloomberg Intelligence. What's left to be seen is whether they will start consistently shopping more at Whole Foods stores.