Prices of some important products—airline flights, mobile phone calls, broadband Internet service—are higher in the United States than in many other countries, notably those in Europe There are complications with each of these measures;the HHI for food retailing, to take one example, is hard to interpret when supercenters, drugstores, dollar stores, gas stations, meal kits ordered online, and prepared meals delivered by DoorDash all offer food for at-home consumption in competition with grocery stores The current stars’ pretax profit margins, he adds, are similar to those of stock market stars of earlier years;what distinguishes them is their much higher after-tax profit margins, a function of tax policy rather than productivity

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大逆转：美国如何放弃自由市场。作者：Thomas Philippon 马萨诸塞州剑桥：哈佛大学出版社的 Belknap 出版社，2019 年。xii + 343 页。数字、表格、词汇表、附录、参考文献、索引。布，29.95 美元。国际标准书号：9780674237544。

一些重要产品的价格——航班、移动电话、宽带互联网服务——在美国高于许多其他国家，尤其是欧洲这些措施中的每一项都有复杂性；食品零售的 HHI，采取举个例子，很难解释什么时候超级中心、药店、一元店、加油站、网上订购的餐包、DoorDash 提供的预制餐都提供在家消费的食物，与杂货店竞争当前明星的税前利润率，他补充说，与早年的股市明星相似；区别在于他们更高的税后利润率，这是税收政策而非生产力的作用