Before revision:   We further find that  " Luckiest draw" recipients , or those who obtain the largest shares of their corresponding red packets, are 1.5 times more likely to pay it forward than other recipients .
After revision:  Moreover, our analysis shows that recipients' contagion may be driven by different types of reciprocity. We further find that " Luckiest draw" recipients , or those who obtain the largest shares of their corresponding red packets, are 1.5 times more likely to pay it forward than other recipients .