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 . Our analyses indicate that in a multiple recipient setting, users' pay-it-forward behavior is enforced by a group norm that luckiest draw recipients should send the first subsequent gift and promoted by their distributional social preferences of the random amounts split by the platform.
After 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 , and identify a group norm that luckiest draw recipients should send the first subsequent gift and promoted by their distributional social preferences of the random amounts split by the platform.