Oops.

Few people noticed, but China got smaller the other day. According to new estimates, the colossal Chinese economy that has been making marketers salivate and giving others an inferiority complex may be roughly 40 percent smaller than previously thought: worth $6 trillion rather than $10 trillion.

It turns out that things in China are more expensive than we thought. It’s as though we discovered that the real price of the noodles in Beijing was 50 yuan, yielding a P.P.P. of 12.5 yuan to the dollar rather than 10. That means the Chinese are relatively poorer and China’s economy is smaller than everybody thought.

This is not a mere technicality.