All simulators
Spillovers & Saturation
Direct and spillover effects of deworming-style treatment; why within-village comparisons miss the total effect.
Day 32: SUTVA & Interferencewithin-village comparison
20.0
= direct effect
spillover on the untreated
8.0
total effect on the treated
28.0
direct + spillover
average effect per household
18.0
treated villages vs pure control
Spillovers scale with the share of the village treated (here: spillover = slider value × saturation / 0.5). A within-village comparison captures only the direct effect; pure control villages are needed to see spillovers and the policy's total effect.