An increasing number of people are afraid that the economic slowdown in China is bad news for the rich economies of the West.

Lord Turner, the former head of the U.K.'s Financial Services Agency, calls the slowdown the "biggest risk to the global economy." Hedge-fund billionaire George Soros agrees.

In an age where we're on the lookout for the next big macroeconomic risk or black swan, a China slowdown seems like an obvious candidate for Next Big Thing to Worry About. But would a China slowdown really be that bad for the U.S.? The answer isn't obvious.