The Old World’s Bill

Demography, dollar imbalances and the monetary settlement of the 2030s

Every reserve system is a contract about the future. A Treasury bond is a claim on future American taxes. A pension is a claim on future workers. A house price is a claim on the income of the next buyer. A trade surplus becomes a portfolio of claims on somebody else’s production.

The demographic foundation beneath that arrangement is changing. China, Germany and Japan are among the 63 countries and areas whose populations have already peaked. One quarter of the world’s population now lives in such a country. By the middle of the 2030s, the number of people aged 80 and above is projected to exceed the number of infants worldwide. The United Nations expects the shift to continue even in many countries whose total populations are still growing.

At the same time, the income and wealth of younger adults have failed to keep pace with the claims they are expected to support. Older working-age people enjoyed faster income growth than 25-to-34-year-olds in more than two-thirds of OECD countries with available data. Across 19 OECD economies, households headed by people aged 55 and above hold roughly six times the net wealth of households headed by people aged 25 to 34. The younger group spends, on average, 14 percentage points more of its disposable income on housing than households headed by someone over 65. OECD Employment Outlook 2025

These figures expose the monetary system’s weak point. Financial claims accumulated by older, wealthier and frequently surplus-running societies must ultimately be validated by the future income of a smaller and less capitalized generation. If that income does not rise, the promises cannot all be honored at their current real value.

This is the invisible force beneath the Fourth Turning: a large stock of inherited claims, a weakening flow of income beneath them, and a political system that postpones deciding who takes the loss.

Pettis’s imbalance, one generation down

Michael Pettis moves the trade analysis inside national economies. When wages and household income rise more slowly than production, consumption cannot absorb the output. Capital subsidies, weak social protection and policies favoring producers over households can create the gap. The excess is exported and the corresponding savings invested abroad.

Another country must import those savings. The United States has played that role because its markets are large, liquid and open. Foreign demand for dollar assets supports the currency and American asset prices while forcing an offset through lower domestic savings, higher debt, fiscal deficits, unemployment or bubbles.

Pettis therefore calls dollar dominance an exorbitant burden. Bilateral tariffs can redirect trade, but they do not change the global saving identity. A durable correction requires surplus economies to consume more, deficit economies to absorb less, or rules that restrict excess foreign savings. Pettis lays out the mechanism here.

Demography adds another level to the accounting. Older households own more bonds, equities and property. Younger households supply labor, pay taxes, rent or buy those properties, and fund social insurance:

Layer	Accumulated claim	Income that must validate it
International	Foreign reserves and cross-border assets	Deficit-country production and taxes
Fiscal	Public debt, pensions and healthcare promises	Future worker taxes and productivity
Property	Housing wealth and mortgage collateral	The next cohort’s wages and borrowing capacity
Corporate	Equity valuations and retirement portfolios	Future profits and household demand

Aging does not automatically mean stagnation

Fewer workers and more retirees create obvious fiscal pressure. The OECD old-age dependency ratio rose from 19% in 1980 to 31% in 2023 and is projected to reach 52% by 2060. Aging-related pension and health expenditure could rise by about three percentage points of GDP over the same horizon. Worker scarcity can nevertheless create a productivity boom.

A new paper by Daron Acemoglu, David Autor, Keelan Beirne and Andrew Scott finds that lower birth rates are associated with higher growth in output per working-age adult, faster wage growth, more labor-saving patents and higher total factor productivity. Their empirical design points to a shrinking young labor force as the relevant mechanism. When young labor becomes scarce, firms have a stronger incentive to automate and reorganize production. “Baby Busts and Growth Booms”

The decisive question is who captures the productivity created by scarcity. If wages, household income and consumption rise, fewer workers can support more retirees because each produces and earns more. If capital remains artificially cheap while wages lag productivity, output expands without matching demand. The excess is exported while the income base supporting consumption, family formation and public finances stays weak.

China sits directly on this fork. Its shrinking workforce gives it a rational reason to lead in robotics, artificial intelligence and industrial automation. Its domestic allocation system also makes capital unusually cheap relative to labor. If automation is accompanied by a larger household share of income, China can rebalance toward consumption and reduce its external surplus. If the gains remain concentrated in producers and the state, automation allows the existing surplus model to run longer and at greater scale.

The IMF estimated China’s current-account surplus at about 3.3% of GDP in 2025 amid weak domestic demand and continued export reliance. IMF China Article IV Labor-saving technology can become the cure for the imbalance or the machinery that intensifies it.

The missing balance sheet belongs to the young

Employment rates conceal much of the problem. A young worker can have a job and still be unable to leave the parental home, form a family, buy an asset and save for retirement. Older cohorts entered housing before decades of falling rates and asset appreciation. Younger cohorts arrive afterward, facing higher rents and down payments from wages that did not share equally in the gain.

Inheritance does not reliably solve the timing problem. Housing is usually transferred after death, frequently when the recipient is already middle-aged. The OECD finds that young households receiving a substantial gift or inheritance are often about twice as likely to own a home as non-recipients, while inherited housing wealth is heavily concentrated near the top of the wealth distribution. OECD on housing and inheritance

Outside rich economies, the problem appears in a different form. Many of the countries with the youngest populations lack enough formal jobs, capital and infrastructure to turn youth into a demographic dividend. The International Labour Organization estimates that around one in five young people globally is outside employment, education or training, and that the share began rising again in 2025. Young women are disproportionately excluded. ILO data

The world has labor where capital and institutions are weak, and capital where labor is aging. Migration could connect them, but aging economies need more workers, taxpayers and caregivers than their electorates may accept. Young economies need capital and employment, while dollar funding leaves them vulnerable to external shocks. The economic solution collides with the identity politics of the Fourth Turning.

The fertility feedback loop

Housing costs delay household formation. Delayed household formation lowers completed fertility. Lower fertility reduces the future workforce. A smaller workforce raises the expected tax and care burden on each future worker. That expectation encourages precautionary saving and makes young households even more cautious about having children.

This loop matters for external imbalances. In societies with weak public safety nets and uncertain pension adequacy, aging can keep household saving elevated even when standard life-cycle theory predicts that retirees should draw down assets. Governments and corporations may also continue saving on behalf of households. Japan illustrates how the form of the surplus can change rather than disappear: its current account is now supported heavily by income earned on a large stock of foreign assets. IMF Japan Article IV

Why the neutral reserve bid keeps growing

The search for a neutral reserve asset responds to sanctions, fiscal deficits and currency debasement. Demography deepens the motive: aging societies hold more financial claims relative to future domestic income and become more sensitive to the political promises behind them.

Gold is the natural state-level response. It is not another country’s liability, carries no default risk and already sits inside official reserve frameworks. Central banks bought an estimated 863 tonnes in 2025, below the exceptional pace of the preceding three years but far above the 2010–2021 average. Some of gold’s increasing reserve share reflects its price appreciation, so purchase quantities remain the cleaner signal. World Gold Council

Bitcoin is developing as the private-sector version of monetary neutrality. Its fixed supply and portability appeal to people who distrust domestic institutions and foreign reserve issuers. The United States’ Strategic Bitcoin Reserve gives that role official recognition, although it initially consists of forfeited assets and additional purchases must be budget neutral. White House executive order

Neither asset performs the dollar’s full job. Gold does not provide elastic credit, and Bitcoin remains too volatile for ordinary central-bank liquidity management. The dollar still supplies the balance sheet required to clear a panic. It remains dominant in trade invoicing and was on one side of 89.2% of foreign-exchange trades in April 2025. BIS Triennial Survey

This produces the central monetary sequence of the coming decade:

Reserve diversification advances during calm periods.
A shock produces a dollar funding squeeze.
The dollar rises and leveraged balance sheets outside the United States weaken.
The Federal Reserve and allied institutions provide liquidity through swaps, repo facilities or new official mechanisms.
The rescue preserves the dollar network while transferring more risk to public balance sheets.
Demand for gold and Bitcoin rises after the rescue because the policies required to save the system weaken confidence in its long-term real value.

Arthur Hayes’s FIMA thesis is one version. Japan could repo Treasuries to the Federal Reserve, receive dollars and buy yen without selling the collateral. The facility could protect Treasuries and fund intervention, but it would not create a JGB buyer. Persistent liquidity would require rollover, moving the imbalance into official rollover risk. Hayes’s “Yen-quake”

The Dollar Milkshake and de-dollarization can therefore operate together. The dollar becomes scarcer during each crisis. Neutral reserves become more desirable after each rescue.

The political clearing mechanism

The fiscal arithmetic makes a smooth resolution difficult. In 2021, pensions accounted for about 38% of public social expenditure across OECD countries, or roughly 8.5% of GDP. Approximately half of health expenditure already goes to older people. Family benefits received 2.1% of GDP. A shrinking workforce will be asked to finance a rising bill while holding a smaller share of the wealth accumulated during the system’s expansion.

When productivity is insufficient or its gains are distributed narrowly, the loss must be allocated politically. There are only a few broad methods:

Transfer more income toward workers and young households through wages, housing reform, family support and taxation of rents or inherited wealth.
Reduce the real value of accumulated claims through inflation, negative real interest rates and financial repression.
Reduce explicit promises through pension, healthcare and entitlement reform.
Import workers through migration and accept the accompanying integration costs.
Accelerate automation and hope productivity rises faster than the dependency burden.
Redirect the conflict outward through protectionism, capital controls and geopolitical blocs.

The Fourth Turning is not a market timer. It identifies the political conditions under which incremental reform stops working: institutions lose legitimacy when they protect nominal promises while the capacity to honor them deteriorates.

A Fourth Turning begins when the argument is no longer about the size of the future surplus. It becomes an argument about which promises survive the settlement.

A working map of 2026 to 2036

Between 2026 and roughly 2029, aging surplus economies are likely to push harder into automation, industrial subsidies and export capacity. Deficit economies will respond with tariffs, local-content rules and national-security investment. Labor shortages will coexist with youth underemployment because workers, skills and locations do not match. Gold diversification and Bitcoin’s regulated adoption will continue.

A later clearing window cannot be dated confidently. A Treasury-market disruption, Japanese funding shock, Chinese balance-sheet event, recession or geopolitical rupture could expose the incompatibility between domestic promises and capital flows. The first reaction would probably be a Dollar Milkshake: a stronger dollar, weaker leveraged assets and forced demand for liquidity. Gold may be volatile and Bitcoin may initially fall with risk assets.

The policy response would matter more than the catalyst. Swap lines, repo facilities, yield management and guarantees would prevent nominal liquidation while shifting losses toward currencies and sovereign balance sheets. Gold and Bitcoin would benefit from the rescue more reliably than from the original panic.

By the early-to-middle 2030s, the probable destination is a managed, multi-asset system. The dollar remains the principal funding and transaction currency, with a lower share of official reserves and more visible political conditions attached to access. Gold holds a larger role in state reserves and bilateral settlement. Bitcoin occupies a larger role in private savings and collateral, with selective sovereign ownership. Regional payment systems become large enough to reduce exposure to American sanctions without replacing the dollar globally.

Trade will also be more managed. Capital-inflow taxes, reserve rules, strategic tariffs, industrial subsidies and local-content requirements will attempt to force the adjustment exchange rates failed to deliver. The system may be less efficient and more stable if it restores household income. If it merely preserves asset values behind new controls, the conflict will continue.

What would make this view wrong

Four developments would produce a more benign decade:

Chinese household income and consumption rise enough to move the current account toward balance.
Labor scarcity accelerates automation, but real wages capture enough of the productivity gain to support aging societies.
Housing supply, taxation and credit reform reduce the burden on younger adults and stabilize household formation.
Longer working lives and successful migration connect old capital with underused labor. The IMF finds meaningful scope for healthier aging and higher participation to offset part of the growth drag. IMF World Economic Outlook, April 2025

These are genuine alternatives. None is automatic. Each requires redistributing income, opportunity or political power before a crisis performs the redistribution by force.

The settlement beneath the reserve debate

The dollar is the operating system of global credit. Gold is insurance for states that do not want all their reserves inside another state’s promises. Bitcoin is an emerging bearer asset for private actors who want a similar exit in digital form. The three can appreciate in different phases of the same adjustment.

The decisive contest will take place below the reserve layer. It concerns whether the income of younger workers rises fast enough to support consumption, family formation, public debt, pensions and the asset values inherited from the previous regime.

If young income rises, demographic scarcity can force a productive rebalancing: wages rise, automation follows, surplus economies consume more and the reserve transition remains gradual. If it does not, the 2030s will allocate the loss politically. The dollar rises during liquidation, public institutions intervene, and gold and Bitcoin benefit from the intervention. Long-standing promises are honored nominally and reduced in real terms.

The old world has accumulated more claims than the young can presently carry. The next decade will decide whether the gap is closed by raising their income or by rewriting the claims.

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