STUDY:Hospital-knock-stay in the couch/ get up ?
without alerted- 'OMG' after open the door
when alerted by call- donations down by 1/4
given option- down by half
Conclusion(make people pay)
knock on the door- effective in short-term- people doge it - X prssured
focus on 25%-altruism-long-term donator
give little gifts,like calender- expect them give back
