Property Tax Compliance in Tanzania: Can Nudges Help?
研究在坦桑尼亚达累斯萨拉姆通过短信提醒、强调税收与公共服务关联及社会压力等助推方式，发现任何短信都能使财产税缴纳率提高18%，其中强调互惠的短信效果最佳，成本效益比达36:1。
This paper reports the results of a text message campaign aimed at promoting tax compliance among landowners in Dar es Salaam, Tanzania. Landowners were randomly assigned to four groups designed to test different aspects of tax morale. They received a simple text message reminder to pay their tax (a test of salience), a message highlighting the connection between taxes and public services (reciprocity), a message communicating that people who did not pay were not contributing to local or national development (social pressure), or no message (control). Recipients of any message were 18% (2 percentage points) more likely to pay any property tax by the end of the study period. While each type of message resulted in gains in payment rates, total payment amounts were highest for those who received reciprocity messages. The average estimated benefit-cost ratio across treatments is 36:1 due to the low cost of the intervention, with higher cost-effectiveness for reciprocity messages. However, there was significant geographic heterogeneity in both treatment effect sizes and estimated cost-effectiveness across the city, highlighting potential gains to program effectiveness whenever such heterogeneity can be predicted ex ante.