Fostering savings by commitment: Evidence from a quasi-natural experiment at The Small Enterprise Foundation in South Africa
研究南非小额金融机构引入目标卡（要求客户设定储蓄目标并承诺定期存款）对储蓄习惯的影响，发现该机制在第二学期显著改善储蓄行为，表明承诺机制是有效的储蓄激励手段。
We studied the effects of a pilot project that strengthened savings incentive mechanisms. The project was established by The Small Enterprise Foundation (SEF), a leading microfinance institution based in South Africa. The program introduced a savings stimulus in the form of a Goal Card: clients subscribing to this (non-coercive) tool were required to identify a savings goal and to commit to regular payments to reach it. The experiment had a quasi-natural approach as it was implemented by SEF in non-randomly selected locations. Difference-in-differences estimates show improved savings habits among those of the foundation’s customers who were involved in the program, compared to the counterfactual that are identified using propensity score matching. The effect of the program manifested in its second semester, suggesting a persistent change of habits but a slow accumulation of savings. We conclude that asking microcredit customers to identify a savings goal and commit to a regular savings amount to achieve it is a promising savings incentive mechanism.