Good friend, former USACE sanitarian, and hydrophilanthropist Bob Jarrett sent me this article by Benjamin A. Olken: 'Hassles versus prices', Science 26 August 2016, Volume 353, Issue 6302, pp. 864-865. DOI: 10.1126/science.aah5055pp.
He included the following note:
I found this to be a rather innovative way to promote water disinfection. Yes, it is a give-away, but it requires people to invest something that they have. Enjoy — maybe implement. Bob
If Bob thinks it's worth a read that's good enough for me.
Suppose that a government or NGO has a valuable health product, such as bed nets to prevent
infection by malarial mosquitoes or hand soap to prevent the spread of disease. It wants to distribute this product to those who need it, but not everyone needs or will use the product. Thus, if the organization gives the product away for free, a substantial amount may be wasted. On page 889 of this issue, Dupas et al. show that introducing small hassles, such as visiting a store each month to redeem a voucher, can be a much more effective way of reducing wastage than charging for the product.
"At my age I must strike while the iron is available; I can't wait for it to get hot." - Unknown (from Bob Jarrett)