Even now that its economy has started to cool down, with GDP growth expected to be around 7.6% this year China is arguably the most important growth engine in the world. But sentiment has largely turned against China as the bears take the lead in the long-running debate over whether or not China can avoid a hard crash. According to a new book on what drives the Chinese economy, both sides may be missing the point. Understanding the most important trends in China “Looking for stable growth (the optimist case) is ridiculous. Being concerned about volatility (the pessimist case) means…