The large and growing industry of price comparison websites (PCWs) or “web aggregators” is poised to benefit consumers by increasing competitive pricing pressure on firms by acquainting shoppers with more prices. However, these sites also charge firms for sales, which feeds back to raise prices. I find that introducing any number of PCWs to a market increases prices for all consumers, both those who use the sites and those who do not. I then use my framework to identify ways in which a more competitive environment could be achieved.

中文翻译：

---

价格比较网站

价格比较网站 (PCW) 或“网络聚合器”这一庞大且不断发展的行业准备通过让购物者了解更多价格来增加公司的竞争性定价压力，从而使消费者受益。然而，这些网站也会向公司收取销售费用，这反过来又会提高价格。我发现将任意数量的 PCW 引入市场会增加所有消费者的价格，包括使用这些网站的人和不使用网站的人。然后我使用我的框架来确定可以实现更具竞争力的环境的方法。