A Wall Street Journal study revealed that some stores serve higher prices to higher income ZIP codes, as well as to rural areas with less competition. They also might jack the price up for repeat visitors. Browsers know your approximate location (through your device’s IP address), as well as your shopping patterns and preferences (through data saved in ‘cookies’).
Amazon derives many of its sales (around 40% in 2008) from third-party sellers who sell products on Amazon. Associates receive a commission for referring customers to Amazon by placing links to Amazon on their websites if the referral results in a sale. Worldwide, Amazon has "over 900,000 members" in its affiliate programs. In the middle of 2014, the Amazon Affiliate Program is used by 1.2% of all websites and it is the second most popular advertising network after Google Ads. It is frequently used by websites and non-profits to provide a way for supporters to earn them a commission. Amazon reported over 1.3 million sellers sold products through Amazon's websites in 2007. Unlike eBay, Amazon sellers do not have to maintain separate payment accounts; all payments are handled by Amazon.
Throughout the store there are features like “Most-Wished-For,” a collection of products that are most added to Amazon.com Wish Lists; “Trending Around NYC,” hot products that NYC-area customers are buying on Amazon.com; “Frequently Bought Together”; and “Amazon Exclusives.” These features, along with customer review cards with quotes from actual customer reviews, make it fun and easy to shop.