Loan-officer-named SMS reminders cut arrears only for repeat borrowers (2009–10 RCT)

Facts

This article explains existing research; it is not new news. Researchers: Dean Karlan, Melanie Morten and Jonathan Zinman. Fieldwork: 2009–2010 (data collection to June 2010). Partners: Green Bank of Caraga, Rural Bank of Mabitac and the MABS programme. Source: J-PAL evaluation page.

Design: 1,259 new borrowers were randomised into 12 treatment arms combining timing (two days before, the day before, or the day of the due date), framing (benefits of compliance or costs of non-compliance) and personalisation (loan officer's name or client's name), plus a control group. Same source. ¹

Results: reminders overall produced no average improvement in repayment. Among repeat borrowers who had previously borrowed from the same loan officer, messages carrying the officer's name reduced the probability of being past due thirty days after maturity by 5.5 pp (about 41%). Same source. ²

Publication: after a working paper (August 2013), the study was published in Behavioral Science & Policy (online date 16 February 2017).

Analysis

In early-stage collections, the relationship ('who the message comes from') mattered more than wording. The absence of an effect for first-time borrowers without that relationship, and on average, is the key point: blanket SMS reminders alone are unlikely to improve collections. With the Philippine consumer-loan NPL ratio now at 5.49% (July 2026, BSP), the study is relevant to designing low-cost early collection measures.

Implications

Counterpoints and uncertainties

The results come from more than fifteen years ago, two rural banks and a small sample, and may not carry over to today's app-based lending where no loan officer exists. The effect comes from a subgroup analysis and may be due to chance.