China’s central bank “has finally thrown in the towel on supporting the renminbi,” said Eswar S. Prasad, a professor of economics at Cornell University. At the same time, he added, easing its grip on the currency’s value “has blunted criticism by combining the currency devaluation with a more market-determined exchange rate.” The United States and institutions such as the International Monetary Fund have called on China to be more hands-off in managing the renminbi.