Returning an overpayment or found item
Launch library · evergreen read

Returning an accidental overpayment, or handing in something found rather than keeping it, is a small, everyday test of honesty precisely because so few people are actually watching when the choice presents itself. The convenience of simply keeping the money or the item is usually available, and the temptation is genuinely ordinary rather than dramatic.
What makes the choice meaningful is that it costs something real, even if small, and offers no external reward beyond the private satisfaction of having done the right thing. That absence of reward is exactly what makes it a fairly clean measure of a person's actual habits rather than their stated values alone.
Businesses and individuals who consistently return an overpayment or a found item build a quiet reputation for trustworthiness that becomes genuinely useful over time, since people are naturally more willing to extend trust, credit or a second chance to someone with a demonstrated habit of doing the right thing unprompted.