Chinese equivalent of financial "bubble"
When something increases in value at a fast rate it will usually be valued over its actual worth. At some point, the value or cost will fall very rapidly. In English, we call this a "bubble", because you blow a bubble slowly, but it can be burst very quickly.
We refer to the "dot com" bubble, where internet stocks fell in price very rapidly; and of course there is the recent housing bubble in the U.S.
What is the equivalent word in Chinese?