The data comes from the Thasos Group, which analyzes information from location data on millions of mobile phones.
Whole Foods' foot traffic climbed 17 percent year-over-year in the week after it cut the cost of food and was still 4 percent higher than the same period the previous year three weeks later.
Traffic was up 17 percent during the full week after the price reductions and remained up 4 percent for the following week, ended September 16. In the first month, the parent company's site sold around $1.6m in Whole Foods store-brand products in its first month as owner. Of the 11 grocers Thasos included in the study, Trader Joe's 467 stores were located the closest to Whole Foods' 460 stores. The rate is calculated by taking the percentage of regular Trader Joe's customers who visit the chain at least twice a month that reported going to Whole Foods instead on a given day. They also did not convince consumers to drive longer distances to shop at Whole Foods, said Thasos Group Chief Executive Greg Skibiski, who added that the data used for the Whole Foods competitive analysis includes 10 percent of the US population.
A number of retailers were hit hard by Whole Foods price cuts.
According to the statement "the investigation by the company is in process and it will provide extra updates as it learns more".
While the company was recently acquired by Amazon.com Inc., the company says the breach also did not affect any online shoppers.
Another survey reports that customers have seen little benefit from the lower prices. A research firm has been tracking numbers and found that prices have been creeping back up since day one of the deal, and some are even higher than they were pre-Bezos.