It's probably a good impulse to have if you're going into investment.

如果你要去投资的话,拥有这种本性也许是好的

耶鲁公开课 - 金融市场课程节选

Don't buy on impulse, when you're buoyed by tropical cocktails and beautiful sunsets.

FORBES: Magazine Article

"We're not seeing that impulse-control crime, " Mr. Parris says.

WSJ: A California City Is Into Tweeting��Chirping, Actually��in a Big Way

Finally, it helps that books are quasi commodities -- there's no need to try them on before you buy -- and that they're small-ticket, impulse items that are easy to ship.

FORBES: Does Amazon.com really matter?