On the internet era, a price comparison service (also known as shopping comparison or price engine or shopping search engine) allows individuals to see different lists of prices for specific products. Most price comparison services do not sell products themselves, but source prices from retailers from whom users can buy. In the UK, these services made between ￡120m and ￡140m in revenue in 2005, and is growing at an annual rate of 30% to 50%.
Price comparison sites typically do not charge users anything to use the site. Instead, they are monetized through payments from retailers who are listed on the site. Depending on the particular business model of the comparison shopping site, retailers will either pay a flat fee to be included on the site or pay a fee each time a user clicks through to the retailer web site or pay every time a user completes a specified action - for example, when they buy something or register with their e-mail address. Comparison shopping sites obtain large product data feeds covering many different retailers from affiliate networks such as LinkShare and Commission Junction. There are also companies that specialize in data feed consolidation for the purpose of price comparison and charge users for accessing this data. This has since been expanded the technology for business consumers in recruitment. When products from these feeds are displayed on their sites they earn money each time a visitor clicks through to the Merchant's site and buys something.Search results may be sorted by the amount of payment received from the merchants listed on the web site.
About compare shopping data feeds, The general use tabs TXT file or generate this date list script. For example,Yahoo or Shopzilla use Tabs TXT file, also Askcost use Auto script and tables TXT file.
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