Paying interest on your savings will strike most people as odd. Yet some poor people in the developing world do just that. In West Africa, for example, some people pay roving susu collectors a fee amounting to a -40% annual interest rate for looking after their deposits. And the authors of a new book~* about the financial lives of people who earn less than $2 a day find that this sort of "pay-to-save" model is by no means unique to Africa. They encounter a similar phenomenon in India, where a female deposit collector called Jyothi looks after small savings for people in the slums of Vijayawada, at an effective yearly interest rate of -30%.
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