FILE - In this April 21, 2011 file photo, customers line up to get discount vegetables at a supermarket in Beijing, China. Surging inflation that helped trigger protests in Shanghai is prompting China's leaders to turn to a tool they long resisted: Speeding up the rise of the country's tightly controlled currency. (AP Photo/Alexander F. Yuan, File)AP - Surging inflation that helped trigger protests in Shanghai is prompting China's leaders to turn to a tool they long resisted: Speeding up the rise of the country's tightly controlled currency.