Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Given the replacement of cash with cell phone payments, people who are asked to donate to charity can easily promise a donation but delay the transfer until a later date. This may be a way to get out of the ask-situation with a positive image while maintaining the flexibility not to donate. This study explores whether charities can make people keep their promises by making such promises more explicit and more formal.