Churchgoers are happier than non-churchgoers, but not for the reasons people expect.
教友要比一般人更快乐，但并不是由于人们早先认为的原因。
2
However, the gender differences observed between gamers and non-gamers suggest that girls may be gaming for different reasons than boys.
然而，观察玩游戏的人和不玩游戏的人中的性别区别，可以发现女生比起男生，因更多不同的原因去玩游戏。
3
Stevenson and Wolfers provide a number of possible reasons why this occurred, including non-comparable data over time, and increasing income inequality in the US during this period.