An ageing, shrinking population is the slow-motion economic crisis that will reshape global power over the next 30 years
Introduction: The Century’s Slowest Crisis
Demographic change is the slowest of all major economic forces — too gradual to generate news cycles, too structural to respond to policy interventions in the short term, and too certain in its long-term implications to be dismissed as speculative. A country’s population trajectory over the next 30 years can be predicted with greater confidence than almost any other economic variable, because the people who will make up that population in 2055 have already been born.
For a significant portion of the world’s most economically advanced countries, what those predictions show is deeply challenging: declining birth rates, ageing workforces, shrinking active populations, and the fiscal stress of pension and healthcare systems designed for demographic structures that are ceasing to exist. Japan, South Korea, Italy, Germany, and now China face demographic trajectories that will, without significant policy responses, produce sustained periods of economic stagnation, fiscal stress, and declining international economic weight.
Section I: The Scale of the Challenge
South Korea and Japan — The Most Extreme Cases
South Korea recorded a total fertility rate — the average number of children per woman over a lifetime — of approximately 0.72 in 2023, the lowest of any country ever recorded. A fertility rate of 2.1 is required to maintain a stable population without immigration. At 0.72, South Korea’s population is on a trajectory of rapid decline that, if sustained, would reduce its population to a small fraction of current levels within a century. The economic implications — fewer workers to support a growing retired population, shrinking domestic markets, declining tax revenues alongside growing social spending — are already being felt and will intensify significantly.
Japan has been grappling with the consequences of its fertility decline — which began earlier and has been more sustained — for longer than any other country. Japan’s population has been declining in absolute terms since 2011. Its working-age population has been shrinking for decades. The ratio of working-age people to retirees — the dependency ratio that determines the sustainability of pension systems — has deteriorated steadily and continues to do so. Japan has adapted through automation, productivity growth, and gradual changes to immigration policy, but the scale of the demographic challenge has not been fully offset.
| 0.72 South Korea’s total fertility rate in 2023 — the lowest ever recorded for any country A fertility rate of 2.1 is required to maintain population stability without immigration. South Korea’s current rate implies a population trajectory that, if sustained, would fundamentally reshape its economic and social structure within decades. Japan, Italy, Spain, Greece, and increasingly China face similar, though less extreme, challenges. |
| “South Korea’s demographic situation is genuinely unprecedented in the data. A sustained fertility rate below 1.0 has no historical precedent at national scale. The economic modelling of its long-term consequences is difficult precisely because we have no comparable cases to extrapolate from.” — Dr. Nicholas Eberstadt Henry Wendt Chair in Political Economy, American Enterprise Institute; leading demographic economist |
Section II: China’s Demographic Turning Point
China’s population declined in absolute terms in 2022 for the first time since the Great Leap Forward famine of the early 1960s — a symbolic milestone in a demographic transition that will have profound consequences for the world’s second-largest economy. The one-child policy, implemented from 1980 to 2015, has produced a demographic structure characterised by a large ageing cohort, a shrinking working-age population, and a youth population insufficient to replace either. China’s total fertility rate is estimated at approximately 1.1 — well below replacement level — despite the removal of birth limits and various policy incentives designed to encourage larger families.
The economic implications for China are significant and underappreciated in much Western strategic analysis. The ‘demographic dividend’ — the period during which a country has a large working-age population relative to dependents — drove a significant portion of China’s extraordinary economic growth over the past four decades. That dividend is now reversing. The costs of supporting an ageing population, combined with a shrinking workforce and declining domestic consumption, create structural headwinds for economic growth that will compound over the coming decades.
Section III: Policy Responses and Their Limits
Governments facing demographic decline have a limited toolkit: immigration, pro-natalist policies to raise birth rates, productivity-enhancing technology investment, and reform of pension and retirement systems to extend working lives. Each of these tools has political constraints that limit its effectiveness. Immigration can offset population decline arithmetically but requires social and political accommodation of diversity that has proven challenging in many societies. Pro-natalist policies have been implemented across multiple countries — cash payments, childcare subsidies, extended parental leave — with limited demonstrated effect on fertility rates, which appear to be driven primarily by structural social and economic factors that cash transfers can only partially address.
Productivity growth through automation and artificial intelligence offers perhaps the most significant lever for maintaining economic output with a smaller workforce. Japan’s experience suggests that very high levels of automation can partially offset demographic headwinds in manufacturing. But automating the personal service sectors — healthcare, elderly care, education — that grow in importance as populations age is technically more challenging and raises different social questions.
Conclusion: Demographics as Geopolitical Destiny
The demographic trajectories of the world’s major economies will shape their relative power, their fiscal sustainability, and their political stability over the next several decades in ways that current geopolitical analysis often underweights relative to shorter-term factors. Countries with young, growing populations — concentrated in sub-Saharan Africa, South Asia, and parts of the Middle East — face the challenge of creating economic opportunity for rapidly growing workforces. Countries with ageing, shrinking populations — concentrated in East Asia and Europe — face the challenge of maintaining economic dynamism and fiscal sustainability with structurally unfavourable demographic fundamentals. These trajectories are largely set and will play out regardless of policy choices made today. The question for policymakers is not whether demographic change will affect their economies but how effectively they can adapt their institutions, their social contracts, and their economic structures to the demographic realities that are already determined.
