Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We conduct a natural field experiment where we exogenously manipulate a restaurant’s menu to include a third party charitable donation to a hunger-related charity when customers select a smaller food portion. We find that generosity is an effective instrument for motivating individuals to reduce their food portion size selection, particularly among Overweight/Obese individuals. Overweight/obese individuals are 35 percentage points more likely to choose the smaller portion when it carries a donation. When the donation is combined with a health information nudge, the proportion of smaller portion choices among overweight/obese individuals increases by 48.2 percentage points compared to the baseline.