Historians may someday debate whether the financial crisis that began a year ago is most notable for how much damage it did to the United States, or how little it inflicted on the world’s major rising power, China. Helped by huge state intervention and buoyant optimism almost surreally undiminished by the crisis of confidence across the Pacific, China has had a very good downturn. It is closing the gap with the world’s most developed economies faster than anticipated and could overtake Japan as the world’s second-largest economy when the final figures for last year are tallied.