lucky enough that we’re able to do something to make other people’s lives a bit easier, at little or no real cost to our own. There are billions of people for whom that isn’t the case, so we have a duty to pick up the slack. Do a bit more than we’re ethically required to do. Pay back the gods of luck. And if we’re not lucky—if life has dealt us a series of blows that mean our internal batteries are running at 1 percent and we’re barely scraping by, well, we fall back on those contractualist rules—we do whatever we can to address the minimum amount we owe to each other.
