Angwin also showed how "Amazon was promoting their own products over others even though the price is not lower." See also her ProPublica series on "machine bias". Angwin's reporting, Weinberg says, "has kicked off more of this in other organizations." Similar methods can be/have been used to show, for example, what looks like racial bias in insurance policies quoted online. "There is also this idea of charging people different prices based on their data or location." What bases do auto insurers, travel sites, banks and retailers use for quoting some readers higher prices, some lower? Is it something as crude as a zip code, as tenuous as a shopping-site visitation history?