Gratitude happens when some kindness exceeds expectations, when it is undeserved.
I'm sometimes grumpier when I stay at a nice hotel. I have certain expectations about the service that's going to be provided. I get impatient if I have to crawl around looking for a power outlet, if the shower controls are unfathomable, if the place considers itself too fancy to put a coffee machine in each room. I'm sometimes happier at a budget motel, where my expectations are lower, and where a functioning iron is a bonus and the waffle maker in the breakfast area is a treat.
These people may have big ambitions, but they have preserved small anticipations. As most people get on in life and earn more status, they often get used to more respect and nicer treatment. But people with dispositional gratitude take nothing for granted. They take a beginner's thrill at a word of praise, at another's good performance or at each sunny day. These people are present-minded and hyperresponsive.
Capitalism encourages us to see human beings as self-interested, utility-maximizing creatures. But people with grateful dispositions are attuned to the gift economy where people are motivated by sympathy as well as self-interest. In the gift economy intention matters. We're grateful to people who tried to do us favors even when those favors didn't work out. In the gift economy imaginative empathy matters. We're grateful because some people showed they care about us more than we thought they did. We're grateful when others took an imaginative leap and put themselves in our mind, even with no benefit to themselves.
Gratitude is also a form of social glue. In the capitalist economy, debt is to be repaid to the lender. But a debt of gratitude is repaid forward, to another person who also doesn't deserve it. In this way each gift ripples outward and yokes circles of people in bonds of affection. It reminds us that a society isn't just a contract based on mutual benefit, but an organic connection based on natural sympathy — connections that are nurtured not by self-interest but by loyalty and service.
If you think that human nature is good and powerful, then you go around frustrated because the perfect society has not yet been achieved. But if you go through life believing that our reason is not that great, our individual skills are not that impressive, and our goodness is severely mottled, then you're sort of amazed life has managed to be as sweet as it is. You're grateful for all the institutions our ancestors gave us, like the Constitution and our customs, which shape us to be better than we'd otherwise be. Appreciation becomes the first political virtue and the need to perfect the gifts of others is the first political task.