China’s migrants are among the thriftiest. That reflects insecurity. Reforms to the country’s hukou system will help https://www.economist.com/finance-and-economics/2026/05/28/without-fanfare-china-is-making-rural-migrants-lives-easier?taid=6a1b8cc9b77dd2000161663d&;utm_campaign=trueanthem&utm_medium=social&utm_source=twitter