Singapore, which I'm visiting at the moment, opens your mind to the highly improbable. Rich, ethnically diverse, cheerfully efficient, globalized in the extreme, it's a man-made economic miracle — astonishing proof of what market forces combined with superb top-down direction can achieve.

Even in Singapore, though, there are limits to what you can believe. I struggle to imagine, for instance, that China's stock market isn't a bubble.

China's leadership has long been impressed with the Singapore model. Since Deng Xiaoping, its government has been much more interested in capitalism in the style of Lee Kuan Yew than class struggle in the style of Karl Marx. In China, the mix of markets and smart management has indisputably worked another miracle, and on a vastly larger scale than Lee's.