> Is the increase in "satisfaction" being offset by something else, or is "satisfaction" (as they define it) simply orthogonal to happiness?
I know a little bit about these kinds of studies. One of them is measuring minute by minute "emotional" sorts of happiness, that's usually what they label "happiness" or "experiential happiness." The other is when you sit and evaluate your life, they call that satisfaction or "reflective happiness."
Actually, the results shouldn't be so surprising. We've only such a capacity for neurons and chemicals firing in our brain, of course a millionaire can't feel 100 times more satiated from food than a guy making $75,000.
Honestly though, I don't believe in experiential happiness, it doesn't matter so much to me. It's just biochemistry, animals feel that kind of happiness. Reflective happiness, thinking happiness, "satisfaction" - that's the one I optimize for. The biochemistry takes care of itself if you live good habits of gratitude, good friends, doing meaningful things, and take care of your basic health.
No matter how many good works you do, how much charity you do, how much money you make, your basic "happiness" or minute by minute emotional happiness only can get so high. But reflective happiness has almost an unlimited capacity, and doing more things you find meaningful does bring that up.