A promise that pays anticipatory effects of an announced tuition waiver in an advanced democracy

Can a mere promise of welfare benefits move voters? This study investigates whether conditional cash transfers (CCTs) yield political rewards only after benefits are delivered or whether credible policy announcements themselves can shift public support. Using Japan's announced but not yet implemented tuition waiver for families with three or more children as an archetypal case of a programmatic CCT, I analyze nationally representative survey data from 6,579 respondents. Applying OLS and a sharp regression discontinuity design (RDD) at the three-child eligibility threshold, I estimate both the average treatment effect (ATE) and the local average treatment effect (LATE) on cabinet approval. The results show a sharp and substantively meaningful increase of about 0.6 points on a five-point scale among households at or above the cutoff, with no comparable shift at placebo thresholds. The effect remains stable and statistically significant across multiple robustness checks, confirming the reliability of the discontinuity. These findings demonstrate that credible programmatic promises can generate measurable electoral payoffs even before any material benefits are delivered. The analysis reveals how governments in advanced democracies can strategically use credible announcements to turn future-oriented policies into present-day political capital.