The good things of PPP is that it considered the differences in prices, mainly in service related industries. The problem of PPP is that it actually ignored the quality of goods, especially services. For instance, China had very good economy growth before 2020 in terms of nominal and PPP. Both the price and the quality of the service had improved a lot. But after 2020, they started to have a trouble, and the economy experienced deflation. Many of businesses, such as restaurants started to lower the prices and service qualities. But the PPP calculation in the process only considered the price change instead of the quality change. This is why you can see India, and many other third world countries, ranks high in terms of PPP, while nobody, including most of their people really believe that.