Earlier today, the International Monetary Fund (IMF) Board approved the inclusion of the Chinese renminbi (RMB) as a fifth currency in the special drawing rights (SDR), the IMF’s currency, as of October 2016. The move was expected and IMF Board approval was never in doubt once the U.S. government signaled that it would not oppose the step. My read is that the Fund staff acted properly in arguing that the RMB now meets the test of being freely useable for international transactions by its members (though some have argued that the IMF was bending its rules for political reasons). Of course, Chinese financial markets remain significantly restricted for private investors, but the SDR’s current primary use is for transactions between members of the IMF (governments). From that narrow perspective the RMB can be judged to be widely used and widely traded because a country receiving RMB as a result of IMF transactions should be able to switch it to any other basket currency at low cost, at any time of the day or night, somewhere in the world. So too perhaps are more than a dozen other currencies freely useable by this measure, but the SDR is for now limited to the largest of those currencies by a separate (export share) measure. Consequently, next year the RMB goes into the basket with a weight of 10.9 percent (compared to current weights, most of China’s share comes from the U.S. dollar which will retain a 41.7 percent share; the other shares will be 30.9 percent for the euro, 8.3 percent for the yen, and 8.1 percent for the pound sterling).