The early empirical evidence of a wide disparity between people's valuations of gains and losses appeared in results of contingent valuation studies in which respondents were asked both how much they would be willing to pay to prevent a loss of an environmental or other amenity, and what sum...

We present a pre-registered experiment testing the effects of three, high-payoff (up to $50,000) vaccine regret lotteries in Philadelphia. In each drawing, residents of a randomly selected “treatment” zip code received half of the 12 lottery prizes (boosting their chances to 59-98x those of...