Irrational exuberance? May be, but it'd be unwise not to ride the wave while it lasts. Investors can make unthinkable profit during a time of "irrational exuberance" such as in the 1990s before the burst of the dot com bubble. Too risky to ride on a bubble? May be, but a simple trailing stop-loss should easily void that risk. I believe the key is not to recognize that we are in a bubble (and get scared off the market too early), but rather to recognize it when the bubble bursts (i.e., being stopped out at the early stage of a bubble burst) so that we do not reenter the market while the burst is still on going. The biggest risk for investors is never during a bubble, but rather after the burst of a bubble by reentering the market too quickly (高手死於抄底).
My two cents.
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