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Want more money in your pocket? Your paycheck matters more than any investment portfolio.
In A Nutshell
- Researchers tracked nearly 300,000 Norwegians over 26 years and found that 95% of people who moved up the income ladder did so through wage increases alone or wages plus investment gains—only 5% rose through investments alone.
- For those who climbed through both income sources, wage increases averaged $38,000 while investment gains averaged just $9,200, with the typical person seeing wages rise by $31,000 versus investment income of only $308.
- The pattern reverses on the way down: capital losses played a bigger role than wage cuts when single income sources drove people down the income rankings, while about half experienced declines in both simultaneously.
- The asymmetry exists because wages follow predictable career progression patterns while investment income is highly concentrated, volatile, and exposed to sudden losses from market downturns and business failures.
An expansive, international research effort reports climbing the economic ladder may not be as simple as following typical wealth-building advice. Scientists say your paycheck is far more likely to lift you up than your investment portfolio, but when you fall down the income rankings, capital losses play a bigger role than wage cuts when only one income source drives the decline.
Researchers tracking nearly 300,000 Norwegians over 26 years discovered a notable asymmetry in how people move up and down the income distribution. When Norwegians climbed the economic ladder between 1993 and 2018, about 95% did so either through wage increases alone or through wages combined with investment gains. Barely 5% rose on investment income alone.
The pattern flips for those sliding down. While about half saw both income sources decline together, capital losses played a much bigger role than wage cuts in pulling individuals down the rankings when looking at single factors.
“Labor income tends to lift individuals up the total income ladder, whereas capital income tends to push them down,” the researchers wrote.
This finding seems counterintuitive in an era when personal finance advice emphasizes building wealth through investments. But the researchers say it stems from basic differences in how these income sources work.
Why Wages and Capital Income Behave So Differently
Labor income generally follows more predictable life-cycle patterns. Career progression and skill development tend to generate steady upward movement. Your salary at 50 is typically higher than at 30, barring major disruptions.
Capital income operates differently. Investment returns are highly concentrated among a small group, extremely volatile, and exposed to sudden negative shocks. While some people experience large positive returns, financial market losses and business failures affect many more in the aggregate.
The study analyzed Norwegian tax records covering individuals born between 1960 and 1964, following them from ages 29-33 in 1993 through ages 54-58 in 2018. The research team developed new methods to decompose total income mobility into its capital and labor components.
What the Norway Data Reveals About Income Mobility
For those who moved up through gains in both income sources, the differences were dramatic. Labor income jumps averaged about $38,000 compared to capital income jumps of $9,200. The typical person in this group saw wages increase by $31,000 while investment income rose by just $308.
For 93% of people experiencing this joint upward mobility, the labor income increase exceeded the capital income gain—often by orders of magnitude.
Capital income in Norway showed extreme concentration. The wealthiest Norwegian’s capital income was nearly ten times larger than the highest labor income. The Gini coefficient—a measure of inequality where higher numbers mean more concentration—ranged between 0.94 and 0.98 for capital income during the study period, compared to 0.35 to 0.41 for labor income.
Most Norwegians had capital incomes very close to zero for much of the period studied, while labor incomes clustered in a more typical bell curve distribution.
When Both Income Sources Move Together
The research identified four main patterns of mobility: upward movement through capital income only, upward movement through labor income only, joint upward movement through both simultaneously, and joint downward movement through both simultaneously.
About 54% of upward mobility came from simultaneous increases in both income sources, meaning people moved up in both the labor and capital income rankings at the same time. Another 41% moved up purely through higher wages. The remaining 5% rose through capital gains alone.
This joint movement of both income sources became increasingly common over the study period. The share of Norwegians ranking in the top 10% of both labor and capital income distributions rose steadily from 1993 to 2018.
Norway provides an ideal setting for this research because of high-quality administrative data and an interesting economic profile. The country combines very low income inequality with high compositional inequality—meaning the wealthy get most of their money from investments while everyone else depends on paychecks. Top earners derive much more income from capital, and this separation has remained relatively stable since 2005.
What This Means for Economic Policy
These findings matter for policymakers concerned with economic mobility. The results point to labor market policies and career development as potentially more important for upward mobility than investment-focused strategies. The research also prompts new thinking about how different income sources should be taxed.
The pattern held even when researchers looked only at dramatic movements—people jumping from the bottom 10% to the top 10% of the distribution, or falling from the top 10% to the bottom 10%. It also remained consistent across different birth cohorts and alternative ways of categorizing self-employment income.
One complexity the researchers couldn’t fully address: high initial wealth might help boost labor income indirectly through better professional networks and opportunities, not just through direct investment returns. Untangling these indirect effects would require additional research.
For now, the data suggests that, for most people, paychecks still matter more than portfolios for moving up the income ladder.
Paper Notes
Limitations
The study acknowledges several limitations. First, the decomposition framework cannot fully capture all mechanisms by which initial wealth affects income mobility, particularly indirect effects such as how parental wealth might provide better access to professional networks that boost labor income independent of capital returns. Second, the analysis focuses on relative mobility rather than absolute income changes, meaning someone could become wealthier in absolute terms while falling in relative rankings. Third, while the study uses high-quality Norwegian register data, the findings may not generalize to countries with different institutional structures, tax systems, or labor market characteristics. Fourth, the study cannot observe inheritances or wealth transfers during the period, which may affect capital accumulation patterns. Finally, the researchers note that their treatment of self-employment income as primarily labor income is somewhat arbitrary, though robustness checks dividing it between capital and labor components showed similar results.
Funding and Disclosures
Roberto Iacono acknowledges financial support from the Research Council of Norway (RCN), project number 315765. The authors declare no competing interests. The authors thank Y. Berman, M. Corak, P. Engzell, S. Filauro, T. Piketty, A. Vesperoni and C. Zoli as well as participants at various academic conferences for their comments on earlier versions of the paper.
Paper Details
Ranaldi, Marco, Joël Bühler, and Roberto Iacono. “Capital and Labor Income Mobility.” World Inequality Lab Working Paper 2025/24, October 2025. The study utilized register data from Statistics Norway covering 293,875 individuals born between 1960 and 1964, observed annually from 1993 to 2018. Marco Ranaldi is affiliated with University College London, Joël Bühler with the University of Barcelona, and Roberto Iacono (corresponding author) with the Norwegian University of Science and Technology, Postboks 8900, NO-7491 Trondheim, Norway.
