What's the most important economic question in the world today? One contender is whether the euro will collapse. Another is whether the U.S. will plunge into a double-dip recession. But a third, and possibly the most important over the long term, is whether China can save the world--or whether the entire country is a $6 trillion bubble that's ready to pop.
That's the size of the Chinese economy, now the second largest in the world, after the U.S.'s. China contributed 19% of global economic growth in 2010, and that's expected to increase to 24% this year. China's strength is essential to...