Even if everyone's quality of life improves, people can remain unhappy if the wealth gap widens. Happiness is tied to relative standing (envy) as much as personal progress, a concept known as the hedonistic treadmill.

The idea that you'll one day be free of problems is a fallacy. Problems are a constant feature of life, indicating that something needs your attention. You don't eliminate problems as you grow; you graduate to more complex and sophisticated ones, which is a sign of progress.

As you improve, your expectations for yourself grow even more quickly. This perpetual gap, a form of hedonic adaptation for skills, means feeling like you "suck" is actually a sign of progress, not failure. Regret is a sign you've grown.

While we understand hedonic adaptation for material goods like cars, it's more damaging in personal growth. A previous personal record you celebrated becomes a mere warm-up set, ensuring your standards always outpace your ability and making you feel like you constantly fall short.

Happiness is a fleeting emotion because its primary trigger is surprise—experiencing something positive you didn't expect. Once an achievement becomes the new normal, the element of surprise vanishes, and the associated happiness fades, regardless of your absolute success.

The brain's reward system resets after an achievement, a process known as the hedonic treadmill. This means the feeling of satisfaction is inherently fleeting. The problem is not that we "can't get no satisfaction," as Mick Jagger sang, but that we "can't keep no satisfaction," driving our constant pursuit of the next goal.

Once you experience a higher standard of living (e.g., a luxury car or premium coffee), it's incredibly difficult to revert to a simpler version. This psychological "ratchet" locks you into higher expenses, making financial flexibility a challenge. The happiest people can still enjoy the simple things.

The psychological principle of "hedonic adaptation" shows your brain quickly normalizes new luxuries. This means flying first class doesn't just provide a temporary boost; it actively makes the once-acceptable coach experience feel like a punishment, reducing your baseline happiness.

This concept, 'prevalence-induced concept change,' shows that as significant problems decrease, our brains don't experience fewer issues. Instead, we expand our definition of a 'problem' to include minor inconveniences, making neutral situations seem threatening. This explains why comfort can paradoxically increase perceived hardship.