AbstractJohn Rawls posited that we could determine the nature of justice if we imagined ourselves observing conditions in society from behind a hypothetical “veil of ignorance.” Not knowing how or where we would end up—rich, poor, empowered, disabled—we would choose governing principles that did not leave one disadvantaged because of his or her circumstances. Rawls's concepts are implicitly embedded in the Affordable Care Act, which guarantees that vastly more Americans can obtain health insurance. The law effectively closed down the de facto lottery that awarded coverage to most but left out millions of others.