This chapter purports to give empirical feedback on impartial reasoning to justice by using online survey experiments. More precisely, the study focuses on whether and how the different conceptions of the veil of ignorance and John Rawls’s method of reflective equilibrium affect real people’s impartial reasoning to justice. The findings show that, while ordinary people support impartial reasoning to the difference principle (maximin), their endorsement of it echoes neither John Harsanyi’s nor Rawls’s reasoning. The results illuminate that findings in human psychology, such as the principles of loss aversion and “perceived luckiness,” cannot be dismissed for denoting the relevant impartial reasoning to justice.