Pourquoi les inégalités mondiales augmentent-elles malgré la croissance économique ?
Global inequality presents one of the most intellectually demanding paradoxes in contemporary economics: the world economy has grown consistently, billions of people have escaped extreme poverty, and yet the concentration of wealth at the top has accelerated simultaneously, producing a world that is simultaneously richer and more unequal than at any point in recorded history.
Annonces
In 2025, the richest 1% of the global population captured 20.3% of global income — up 3.4 percentage points since 1980 — while the top 0.1% alone claimed 8.2% of all income generated on the planet.
Between 2019 and 2025, workers worldwide experienced a 12% decline in real wages even as corporate profits reached record levels, a divergence that illustrates how economic growth and equitable distribution have become increasingly decoupled.
A Pew Research Center survey conducted across dozens of countries in 2024 found that more than 80% of adults see the gap between rich and poor as a very or moderately big problem — and a median of 57% expect children in their country to be financially worse off than their parents.
What makes this paradox particularly difficult to resolve is that it requires distinguishing between several distinct types of inequality that are moving in different directions simultaneously, at different scales, producing data that can be selectively cited to support almost any narrative about whether things are getting better or worse.
Annonces
Understanding why growth has not translated into shared prosperity — and what would need to change for it to do so — is among the most consequential analytical challenges of the early 21st century.
The Difference Between Global and Within-Country Inequality
The first critical distinction in any serious discussion of global inequality is between inequality measured across countries and inequality measured within them, because these two dimensions have been moving in opposite directions for decades.
Between-country inequality — the gap between average incomes in rich and poor nations — declined substantially between 1990 and 2019, driven primarily by the extraordinary economic growth of China and India, whose combined population of nearly three billion people moved up the global income distribution at a pace that compressed the gap between the developing and developed world.
The global Gini index fell from 70 points in 1990 to 62 points by 2019, an annualized decline that represented genuine progress in the convergence of average living standards across national boundaries, lifting hundreds of millions out of extreme poverty in the process.
Within-country inequality, however, moved in the opposite direction in most of the world’s major economies during the same period — the gains from growth were captured disproportionately by those already at the top of national income distributions, producing societies that were wealthier in aggregate but more stratified in their internal distribution of that wealth.
The World Inequality Database documents that this within-country divergence is not limited to the United States, where it is most dramatic, but is a global phenomenon visible across economies at every level of development, from Brazil to Germany to India.
What this means in practice is that a person in the bottom half of the income distribution in a rapidly growing emerging economy may have experienced rising absolute income while simultaneously falling further behind their wealthiest compatriots — a combination of material improvement and relative deterioration that is both real and deeply disorienting.
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How Capital Accumulation Outpaces Labor Income
The structural driver of rising within-country inequality across the global economy is the sustained divergence between returns to capital and returns to labor — a divergence that the economist Thomas Piketty systematized in his landmark 2013 research but that has roots in policy choices and technological shifts stretching back several decades.
When the return on capital — investments, property, financial assets — consistently exceeds the rate of economic growth, wealth concentrates among those who already hold significant assets while those who depend primarily on labor income fall progressively further behind, regardless of how hard they work or how much the overall economy grows.
This mechanism is not controversial among economists — it is the baseline mathematical reality of an economy in which asset prices appreciate faster than wages, which describes the conditions that have prevailed across most of the developed world since the 1980s.
The number of American billionaires rose from 835 in 2024 to 924 in 2025 according to the UBS Billionaire Ambitions Report, with the United States home to nearly a third of the global billionaire population — a concentration of extreme wealth that occurred during a period of sustained nominal economic growth.
| Métrique | 1980 | 2025 | Changement |
|---|---|---|---|
| Top 1% global income share | 16.9% | 20.3% | +3.4pp |
| Top 0.1% global income share | 5.7% | 8.2% | +2.5pp |
| Bottom 50% consumption share | ~7% (2000) | 12% (2025) | +5pp |
| U.S. billionaire count | — | 924 | Record |
The bottom half of the global population did see their consumption share rise from 7% in 2000 to 12% in 2025, a genuine improvement that Brookings research highlights as evidence that global growth has not been entirely captured by elites — but the simultaneous expansion of wealth at the very top means that relative gaps have widened even as absolute floors have risen.
Technology, Automation, and the Skill Premium
The technological transformation of the global economy since the 1990s has been among the most significant structural drivers of inequality both within and across countries, operating through mechanisms that are well understood even as their political implications remain deeply contested.
Automation and digitization have disproportionately displaced middle-skill routine jobs — manufacturing assembly, administrative processing, data entry — while simultaneously increasing demand for high-skill cognitive work and leaving low-skill service work largely untouched, producing what labor economists call labor market polarization.
The result is a hollowing out of the middle of income distributions in advanced economies, as the jobs that historically provided pathways from working-class to middle-class status are automated away faster than new middle-skill employment categories emerge to replace them.
The geography of this transformation amplifies its inequality effects: technological industries concentrate in specific cities and regions, producing local prosperity while leaving other areas behind in ways that look like individual failure but are in fact structural outcomes of decisions about where capital and talent are directed.
The World Bank has documented that the returns to tertiary education increased substantially in most economies over the past three decades, creating a growing premium for skills that higher education systems have been unable to distribute equitably enough to prevent the premium from widening into a structural divide.
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The geographic concentration of technological wealth also means that the countries best positioned to benefit from the AI transition — those with established technology sectors, strong intellectual property regimes, and access to large computational resources — are predominantly the countries that are already wealthy, potentially widening between-country inequality in the coming decade even as it had been narrowing.
Tax Policy and the Architecture of Wealth Concentration
The mechanisms of capital accumulation and technological change do not operate in a policy vacuum — they are significantly amplified or constrained by tax systems that determine how much of economic growth is redistributed through public investment and how much is retained by those who already hold the greatest share of productive assets.
The global race to attract capital through corporate tax reduction produced a sustained decline in effective corporate tax rates across most major economies from the 1980s onward, reducing the public revenue available for the education, healthcare, and infrastructure investments that historically provided the most reliable pathways out of poverty for those born without inherited advantages.
Wealth taxes and inheritance taxes — the policy instruments most directly targeted at intergenerational wealth concentration — have been reduced or eliminated in most high-income countries over the same period, allowing the concentration of capital to compound across generations in ways that increasingly resemble the hereditary wealth structures that characterized pre-industrial societies.
A median of 60% of adults surveyed by Pew Research in 2024 believe that rich people having too much political influence contributes a great deal to economic inequality — a perception that the political science literature on regulatory capture and campaign finance broadly supports.
Le Fonds monétaire international has repeatedly documented that inequality above certain thresholds reduces economic growth rather than accelerating it, undermining the argument that concentration of wealth is a necessary byproduct of efficiency — but this research has had limited effect on the policy trajectories of most major economies.
Climate Change as an Inequality Amplifier
Among the factors most likely to determine whether global inequality continues to rise or begins to decline, climate change deserves specific attention as a mechanism that systematically transfers costs from wealthier to poorer populations while operating through seemingly impersonal natural processes.
The countries and populations most vulnerable to rising temperatures, extreme weather events, agricultural disruption, and sea-level rise are disproportionately those that have contributed least to cumulative greenhouse gas emissions and that have the fewest financial resources to adapt — a distribution of burden that represents perhaps the largest single transfer of costs in human history.
Small island nations, Sub-Saharan African agricultural economies, and South Asian coastal populations face existential climate risks from warming that was produced primarily by the industrial development of now-wealthy economies, and the financing available for their adaptation is a fraction of what the World Bank estimates is required.
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The World Bank’s projection that climate change could push an additional 100 million people into extreme poverty by 2030 under business-as-usual scenarios represents not a natural disaster but a policy outcome — the result of inadequate mitigation by wealthy emitters and inadequate adaptation support for vulnerable populations.
Within wealthy countries, climate impacts also concentrate in lower-income communities through mechanisms of housing geography, occupational exposure, and healthcare access that ensure the costs of extreme heat, flooding, and air quality degradation fall most heavily on those least equipped to manage them.
Conclusion
Global inequality is increasing despite economic growth because growth and distribution are determined by different forces — the former by aggregate productivity, the latter by power, policy, and the structural rules governing how gains are shared among those who contribute to producing them.
The richest 1% capturing 20.3% of global income while workers worldwide saw real wages decline by 12% between 2019 and 2025 describes not a natural outcome of growth but the result of specific choices about taxation, labor regulation, intellectual property, and the political representation of different economic interests.
The distinction between between-country inequality, which has improved substantially, and within-country inequality, which has worsened in most of the world, is essential to any honest account of where progress has been made and where it has not.
What the data ultimately reveals is that shared prosperity is not an automatic consequence of economic growth — it is a political achievement that requires sustained, deliberate institutional design, and that its absence in an era of remarkable aggregate wealth creation reflects choices that remain reversible rather than forces that are inevitable.
FAQ
1. Is global inequality actually increasing or decreasing? Both, depending on how it is measured. Between-country inequality has declined as emerging economies grew faster than wealthy ones. Within-country inequality has increased in most major economies, with wealth concentrating at the top even as national averages rose.
2. Why doesn’t economic growth automatically reduce inequality? Because growth and distribution are determined by different mechanisms. Growth measures aggregate output; distribution depends on who owns productive assets, how labor is compensated relative to capital, what tax policies exist, and how political power shapes the rules governing each.
3. How much of global income do the richest people capture? In 2025, the richest 1% captured 20.3% of global income, up from 16.9% in 1980. The top 0.1% alone claimed 8.2% of all global income, according to the World Inequality Database.
4. What role does technology play in rising inequality? Technology has polarized labor markets by automating middle-skill routine jobs while increasing the premium for high-skill cognitive work, concentrating the gains of technological progress among those with capital and advanced education while displacing the jobs that historically provided upward mobility.
5. How does climate change affect global inequality? Climate change amplifies inequality by concentrating its costs on the poorest and most vulnerable populations — those who contributed least to emissions and have fewest resources to adapt — while the wealthiest populations, who produced the most emissions, retain the greatest capacity to protect themselves from the consequences.
