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Essay

The Log Curve: Money and Happiness, Without the Meme

June 16, 20268 min read

You have seen the chart. Happiness climbs with income up to about $75,000 a year, then flattens. Buy what you need, the story goes, and the rest is just numbers. It is a tidy fact. It is also wrong — or at least so simplified that it has stopped meaning what people use it to mean.

We want to read the actual research here, carefully, because our whole case rests on getting it right. If money bought happiness without limit, the measure of a life would already be settled and we would have nothing to add. If money bought nothing past a hard cutoff, we would not need to argue at all. The truth is in between, and the in-between is where the interesting claim lives.

Where the $75k number came from

The flattening line traces back to one paper: Daniel Kahneman and Angus Deaton, in 2010, working with a large sample of US survey responses. They found two different things, and the popular version collapsed them into one. Life evaluation — how good you judge your life to be when you stop and consider it — rose with income without any ceiling. The thing that seemed to plateau near $75,000 was a separate, coarse measure of daily emotional mood, a yes/no read on how the previous day had felt (Kahneman & Deaton, 2010).

That is a narrow finding about one rough instrument. It was never a universal law, and it did not hold up. When the measurement got better, the plateau dissolved.

In 2021, Matthew Killingsworth collected 1.7 million real-time reports from 33,391 working US adults — pinging people on their phones at random moments and asking how they felt right then, instead of asking them to summarize a whole day from memory. Felt well-being kept rising with income, with no plateau, well past $75,000 (Killingsworth, 2021). The finding is correlational and the effect sizes are modest, but the flat line was gone.

Then the two camps did the honest thing. In 2023, Killingsworth, Kahneman, and Barbara Mellers ran an adversarial collaboration — opposing researchers re-analyzing the same data together, agreeing in advance on what would count as evidence — and settled it. Happiness rises with income for most people across the whole measured range. It flattens above roughly $100,000 of household income only for the unhappiest ~20% (Killingsworth, Kahneman & Mellers, 2023). For everyone else, more money still tracked more well-being. The plateau was real for a minority and a meme for everyone who quoted it.

So: there is no universal $75k ceiling. Anyone who tells you otherwise is reading a 2010 footnote as if it were the headline.

The shape that survives every fight

Strip away the dispute over where the line bends, and one thing is signed by all sides: the curve is logarithmic. Well-being rises with the logarithm of income, not with income itself (Stevenson & Wolfers, 2013).

In plain terms: each doubling of income buys about the same increment of well-being. Going from $30,000 to $60,000 is one step up. To feel that same step again you need $120,000. Then $240,000. The returns never quite reach zero, but they shrink relentlessly. The hundredth thousand does far less than the first.

This is the strongest moral fact in the whole literature, and it is easy to miss inside the math. If each doubling is worth the same, then a dollar does enormous work in a poor life and almost nothing in a rich one. The same dollar, moved from someone with everything to someone with little, buys vastly more human well-being. The shape of the curve is, quietly, an argument about where money should go.

It is worth being clear about one live dispute we are not pretending to have resolved. Within a country at a moment in time, richer people are reliably happier — that much is not seriously contested. Whether decades of national economic growth raise a nation’s average happiness is still argued, fifty years after Richard Easterlin first posed it. Some find growth and happiness rising together; others find the link weak. We report it as an open question, because it is one (Easterlin, 1974; Stevenson & Wolfers, 2008; Easterlin & O’Connor, 2020).

Money causally helps — say it plainly

It would be dishonest, and it would weaken our own case, to claim money doesn’t matter. It does, and not just by correlation. When researchers followed Swedish lottery winners, they found durable gains in life satisfaction lasting up to two decades after the win (Lindqvist, Östling & Cesarini, 2020). A windfall isn’t a sugar high that fades back to baseline. Money buys real, lasting well-being.

We are not anti-money, and we are not asking anyone to abolish it. The mission is narrower and stranger: make impact, not money, the measure of a life. Money is a fine tool for moving resources. It is a poor yardstick for a person. Keep the tool. Question the yardstick.

What the ledger doesn’t count

Here is the gap. The same research that shows income’s shrinking returns also keeps surfacing a set of things that predict a life worth living — and most of them sit outside what money records.

A felt sense of purpose is one of the strongest. Pooling 136,265 people across ten prospective studies, a sense of purpose in life predicted roughly 17% lower all-cause mortality, after adjusting for confounders (Cohen, Bavishi & Rozanski, 2016; adjusted relative risk 0.83). This is observational — purpose was never randomly assigned — so we read it as a strong association, not a proven lever. But the association is large and it concerns survival, not just mood.

Autonomy, competence, relatedness — the feeling of directing your own life, being good at something, belonging to people — form the core of self-determination theory, the best-validated needs framework in psychology. Well-being runs through these, fairly consistently across settings (Ryan & Deci, 2000).

And the damage of losing work goes far beyond the lost paycheck. Fixed-effects panel studies — which follow the same people through job and joblessness, so each person is their own control — find that unemployment hurts life satisfaction well past what the missing income alone would predict (Winkelmann & Winkelmann, 1998). What unemployment also takes is structure, purpose, and a place among others. Replace the income and the wound does not fully close.

The darkest version of this pattern has a name. Anne Case and Angus Deaton documented rising deaths from suicide, drug overdose, and alcoholic liver disease among midlife Americans without a four-year degree. They attribute it — and we name them, because the interpretation is theirs to own — to the slow unraveling of work, community, and meaning, rather than to falling income by itself (Case & Deaton, 2015). That reading has serious critics: Andrew Gelman and others argue the age-adjustment changes the picture, and others point to the opioid supply as a rival explanation. We flag the dispute rather than paper over it. But the bare fact — that despair can rise while a country grows richer — is not new.

Émile Durkheim saw it in 1897. Studying suicide, he found rates rose in economic booms as well as busts. He called it anomie: desire outrunning the norms that give it meaning (Durkheim, 1897). These are nineteenth-century statistics and we cite them as classic theory, not current measurement. But the shape is old. Prosperity without purpose was already a documented hazard before the twentieth century began.

One honesty about our own side

We owe you the weak point in our case, stated as plainly as the rest.

Money’s diminishing curve is measured to a standard nothing else in this debate comes close to. We can write the function. We can argue over where it bends and for whom. For purpose, connection, and meaning, there is no comparable dose-response curve — nobody knows the mathematical shape of “more meaning,” and we are not going to invent one. What the evidence actually shows is that the associations between these things and well-being, health, and survival are large, and that they do not fade as income climbs.

So what we have is not a rival curve. It is a measured gap — a precise account of how little the top of money’s curve can reach, and a pile of strong but un-curved evidence about what lives in the space money’s curve leaves empty. That is the honest claim. Not “money fails,” but “money’s success is bounded, and we can see the boundary, and the most important things are on the far side of it.”

This is also why our answer is not a number. We are not proposing to score meaning, or to rank lives, or to build one global measure to replace GDP. A single measure of standing would inherit every pathology money’s measure has, and add new ones. The unit of recognition we care about is plural, conferred by people on each other, carried rather than cashed, and never reduced to one ledger. Meaning leads; the curve bends but never switches off; and the work is to honor what the count forgets — not to count it harder.

If you want the rest of the argument — why a measure can corrupt the thing it measures, why we still think recognition is worth the risk — it is on the Foundations page. This essay only had one job: to get the money-and-happiness research right, because everything downstream depends on it.

Impactism is a movement, not yet a legal entity. We are arguing in the open, with the sources in plain view, because a claim about what makes a life worth living should be checkable. These are.

Sources

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