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Katy Milkman of the Wharton School and colleagues helped Philadelphia design a system that uses a sweepstakes to incentivize COVID-19 vaccination. Milkman said those living in ZIP codes with the lowest vaccination rates have a significantly higher chance of winning.

https://www.inquirer.com/health/coronavirus/vaccine-sweepstakes-cash-drawing-prize-philadelphia-covid-20210607.html Philadelphia Inquirer