Prices are really useful. But in whole large sectors of the Chinese economy, particularly the banking sector, the government sets those prices. This means huge information loss, and the concomitant possibility that there is a vast misallocation of resources.
Don't those things happen in markets? Hell yes: witness the housing bubble. On the other hand, witness East Germany. To get a really catastrophic misallocation of resources, it seems to take a government; corporations can only screw things up on an artisinal scale.
Emphasis mine. Via Should China Rethink High Speed Rail? - Megan McArdle - Business - The Atlantic.