And they hurt investors, who wind up losing money once the giddy ride ends.
Unfortunately, that unwinding will hurt individual investors much more than institutions.
Was it fair to anybody to delay action which might hurt innocent investors?
No one is suggesting that the big shareholders are pushing for changes that are meant to hurt other investors.
The lack of liquidity obviously hurts investors trying to sell stocks.
So far, though, the unexpected rise of the dollar has hurt investors who bet it would fall for the third consecutive year.
Weaker foreign currencies hurt American investors, because their foreign holdings are worth less when converted back into dollars.
Indeed, China's weak system for raising money and putting it to profitable use is not just hurting investors and state-owned companies, experts say.
Or you can ask: Are you stopping this practice that is hurting investors?
Trade would drop, dramatically hurting exporters, consumers and investors.