PRICE COMPARISON WEBSITES
研究发现，引入价格比较网站（PCWs）会提高所有消费者的价格，包括使用和不使用这些网站的消费者，并探讨了如何实现更具竞争性的环境。
Abstract 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.