Overinvestment in hope of exceptional returns is what a financial bubble is. Excess liquidity in the economy is one of the things that can lead to a bubble, as

Overinvestment in hope of exceptional returns is what a financial bubble is. Excess liquidity in the economy is one of the things that can lead to a bubble, as people look for places to put the money to use. If this is the case now, we should be seeing the same thing in other business sectors that promise the potential of well above average returns.