This is a very important question. Titmuss argued that paying for donations such as blood donations would reduce supply (while standard economics predicts it would increase the supply). This paper suggests that men and women respond differently. http://econweb.ucsd.edu/~jandreon/PhilanthropyAndFundraising/Volume%202/32%20Mellstrom%20Johannesson%202011.pdf …https://twitter.com/Prof_MPastor/status/1041130935138177025 …
