The best economic research is often interdisciplinary.

At that age， I'd take any excuse to make estimates and do minor arithmetic. I'd calculate our gas mileage -- figure out useless statistics on things like grocery spending. I'd been hearing an ad campaign about smoking. I can't remember the details， but basically the ad said， every puff of a cigarette takes some number of minutes off of your life: I think it might have been two minutes per puff. At any rate， I decided to do the math for my grandmother. I estimated the number of cigarettes per days， estimated the number of puffs per cigarette and so on. When I was satisfied that I'd come up with a reasonable number， I poked my head into the front of the car， tapped my grandmother on the shoulder， and proudly proclaimed， "At two minutes per puff， you've taken nine years off your life！"

The voice is an instrument that everyone has.

成功不在于你赚了多少钱，而在于你对人们生活的影响。

胜绰不是不懂得这些道理，而是他把俸禄看得比义还重要。 

The world is changed by your example, not by your opinion.

伟大的品牌不追逐趋势，而是创造趋势。