Companies are waging an invisible data war online. And your phone might be an unwitting soldier. Retailers from Amazon and Walmart to tiny startups want to know what their competitors charge. Brick and mortar retailers can send people, sometimes called "mystery shoppers," to their competitors' stores to make notes on prices. Online, there's no need to send people anywhere.
Learn about your ad choices:
dovetail.prx.org/ad-choices
