The only thing rising faster than China is the hype about China. In January, the People’s Republic’s gross domestic product (GDP) exceeded that of Britain and France, making China the world’s fourth-largest economy. In December, it was announced that China replaced the United States as the world’s largest exporter of technology goods. Many experts predict that the Chinese economy will be second only to the United States by 2020, and possibly surpass it by 2050.

Western investors hail China’s strong economic fundamentals—notably a high savings rate, huge labor pool, and powerful work ethic—and willingly gloss over its imperfections. Businesspeople talk about China’s being simultaneously the world’s greatest manufacturer and its greatest market. Private equity firms are scouring the Middle Kingdom for acquisitions. Chinese Internet companies are fetching dot-com-era prices on the NASDAQ. Some of the world’s leading financial institutions, including Bank of America, Citibank, and HSBC, have bet billions on the country’s financial future by acquiring minority stakes in China’s state-controlled banks, even though many of them are technically insolvent. Not to be left out, every global automobile giant has built or is planning new facilities in China, despite a flooded market and plunging profit margins.

And why shouldn’t they believe the hype? The record of China’s growth over the past two decades has proved pessimists wrong and optimists not optimistic enough. But before we all start learning Chinese and marveling at the accomplishments of the Chinese Communist Party, we might want to pause for a moment. Upon close examination, China’s record loses some of its luster. China’s economic performance since 1979, for example, is actually less impressive than that of its East...