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Covert framing successfully measured baseline discrimination where control group participants sacrificed goods worth nearly twice the median daily per capita food expenditure to avoid selecting transgender workers, while eliminating experimenter demand bias.
Retention rates remained highly balanced across recruitment channels (56% retained inside MTO branches vs. 52% retained in public areas), confirming observable baseline balance across gender (74% female), age (mean 35 years), and monthly income (55% above median).
Stationing enumerators inside UAE Exchange MTO premises significantly reduced participant suspicion and survey refusals, achieving a 56% retention rate for branch recruits compared to 52% for public intercept recruits.
The upfront $10 cash incentive produced a 23% response rate compared to 16% for the conditional $50 check alone (t-statistic = 1.81, p-value = 0.08), helping raise the study's overall response rate to 46% across mailings.