Stephan, you must know something that I don’t. As far as I know, once you converted your dollar into Yuan, you can’t just exchange it back to dollar (or any other currency). My parents couldn’t, and I couldn’t (when I travel to China, if I converted some dollars and keep my original receipt, then yes, I can convert back the left-over RMB). That’s why many people go to the black market. That’s why it’s a controlled currency. On my last trip, I did some American collegues favor to exchange dollar for their RMB because they lost their receipts. And I’m pretty sure that if the rule has changed, it’s a big news and I’d know it. It’s easy to exchange into RMB, but not that easy to get out (easier today if you have good connections in China, but not freely).