Baseline Income Level Heterogeneity
RCTClinical Trial
Interventions designed to alter financial transfer behavior may produce varying impacts depending on the sender's baseline earnings capacity. Disaggregating treatment effects across income strata is necessary to prevent misinterpreting overall null or marginal average treatment effects.
Picture this
Consider offering a budget-tracking tool to two workers: one struggling on a minimum wage with zero discretionary income, and another earning a higher salary with surplus cash available. The higher-earning worker can afford to send extra funds once given a tool to structure spending, whereas the lower-earning worker remains financially constrained regardless of budgeting support.
What the evidence says
Access to remittance labeling significantly increased the weekly remittance probability (+1.1 percentage points, p < 0.05) and log remittance amount (+0.093, p < 0.10) for above-median income migrants, but had no statistically significant impact on below-median income migrants (+0.2 percentage points, p > 0.10).
- Who was studied
- 2,455 migrants with above-median monthly income (above 3,001 AED) and 1,996 migrants with below-median income out of 4,451 analyzed Filipino workers in the UAE.
- How
- Ordinary least-squares panel regression with individual and week fixed effects evaluating weekly remittance probability, frequency, and amounts across monthly income subsamples.
What to do
Target financial behavior labeling features toward higher-income migrant segments who possess unallocated discretionary income capacity.
From the source
"There is also heterogeneity in the labeling treatment effect with respect to baseline income levels. The migrants for which the labeling feature triggers a significant increase are those with relatively higher income (i.e. income above the median)."
A Field Experiment among Filipino Migrant Workers in the UAE