發送短信 : Nudging private Ryan: mobile microgiving under economic incentives and audience effects

   _____    _____    _    _    __   __    _____   
  / ___//  |  ___|| | |  | ||  \ \\/ //  / ____|| 
  \___ \\  | ||__   | |/\| ||   \ ` //  / //---`' 
  /    //  | ||__   |  /\  ||    | ||   \ \\___   
 /____//   |_____|| |_// \_||    |_||    \_____|| 
`-----`    `-----`  `-`   `-`    `-`'     `----`