Even apart from the instability due to speculation, there is the instability due to the characteristic of human nature that a large proportion of our positive activities depend on spontaneous optimism rather than mathematical expectations, whether moral or hedonistic or economic.
Most, probably, of our decisions to do something positive, the full consequences of which will be drawn out over many days to come, can only be taken as the result of animal spirits—a spontaneous urge to action rather than inaction, and not as the outcome of a weighted average of quantitative benefits multiplied by quantitative probabilities.
< by Wikipedia.com>
FOMO : Fear of Missing Out
** Last minutes buying before new rules kick in.
Buyers flock to show-flats before new rules kick in (from The Straits Times)
Panic Selling in property stocks after surprise new cooling measures :