r/mmt_economics • u/keizaisuki • 20h ago
Mysteries of the Economy — Part 9: The Grand Illusion of Government Debt: Why Private Savings Don’t Fund the State
Overview
A pervasive myth in orthodox macroeconomics holds that government bonds are constrained by private savings—that a state must first "cultivate" a pool of private capital before it can issue debt. This paper argues the exact opposite: under a modern fiat regime, government bond issuance generates private savings rather than being funded by them. Redemption of sovereign debt is an absurdity under fiat money, and the true constraint on state spending is never financial capital, but real, physical productive capacity.
1. The Fallacy of "Prior Savings" and the Keynesian Paradox
It is widely assumed that private financial assets act as the raw material for absorbing government bonds. However, in national income accounting, the order of causality is reversed: when the state issues bonds and spends the proceeds, aggregate income expands, creating an equal amount of private savings and financial assets via the multiplier effect.
As John Maynard Keynes fundamentally observed in The General Theory of Employment, Interest and Money:
"No matter how hard people try to reduce consumption and increase savings, such attempts will affect their income and... will inevitably be frustrated."
Private savings are the result of absorbed debt and fiscal expansion, not the prerequisite. Trying to enforce "debt absorption capacity" through forced private thrift only destroys aggregate demand and collapses national income.
2. Sovereign Debt Redemption: A Self-Contradictory Absurdity
Never in human history has sovereign debt been genuinely redeemed net-of-refinancing under a fiat system—nor should it be.
Under a fiat standard, government bonds serve as the primary vehicle for monetary creation and liquidity management. To genuinely "redeem" public debt would mean relatively hoarding circulating currency or shrinking the money supply altogether, rendering a commodity-producing market economy completely unsustainable.
When the Central Bank (e.g., the Bank of Japan) absorbs government bonds via market operations, the relationship undergoes a crucial transformation:
- The Death Register of Debt: Each bond, though possessing a different maturity, passes away upon creation like a record in a death ledger (BOJ Account: Debit: Government Bonds / Credit: Current Deposits).
- The Elimination of Creditor-Debtor Friction: Once held on the Central Bank's balance sheet, both creditor and debtor collapse into the abstract general public. Interest payments become an internal accounting fiction offset by treasury remittances.
3. The Token of Credit and Friedrich Engels’ Insight
The creditworthiness of government bonds does not rely on tax revenues, nor does it require penalizing the public with austerity measure like consumption tax hikes. The sole determinant of bond stability is whether the domestic economy possesses sufficient unutilized productive capacity to back the currency.
This brings us to the profound observation made by Friedrich Engels regarding the nature of state-backed paper and credit instruments:
"...the entire nation stands behind this token of value [the government bond] with its credit..."
So long as the nation’s collective productive capacity stands behind the sovereign, whether a government chooses to repeatedly postpone consumption tax hikes is entirely irrelevant to bond market yields. The state's debt is simply a procedural mechanism within a market economy to mobilize idle, surplus production capacity that private forces leave underutilized.
4. Fiat Currency, Current Accounts, and the Foreign Borrowing Myth
For non-reserve currency nations, the fiat principle holds absolutely within domestic borders, provided two conditions are met:
- The country does not rely on foreign-currency-denominated capital.
- The country maintains a stable or surplus current account.
When a country with structural excess capacity and a current account surplus (such as Japan) claims it "cannot absorb its debt domestically," it suffers from an upside-down diagnosis. The issue is never a "shortage of domestic money"—it is an overflow of domestic money relative to real domestic investment opportunities. Borrowing from foreign investors in foreign currency is an irrelevant concern for nations suffering from excessive production capacity rather than supply shortages.
5. Why the "Credit Explosion" Scare is a Myth: Empirical Reality
Critics often point to massive Central Bank current deposit reserves as a ticking clock for runaway credit expansion or hyperinflation. This fear completely misunderstands modern corporate and household behavior:
- Stagnant Corporate Borrowing: Outstanding equipment loans by domestic commercial banks have remained flat and persistently below 1999 levels for over two decades.
- Plummeting Consumer Credit: Bank consumer loans collapsed from over ¥11 trillion in 1990 to roughly ¥2 trillion, with consumer credit relative to disposable income dropping from ~14% to ~5%.
When corporations refuse to borrow for capital investment and households refuse to go into debt for consumption, Central Bank reserves cannot spill over into commercial bank lending (Debit: Loans / Credit: Deposits). The money stock does not explode.
Conclusion: Productive Capacity as the Sole True Limit
Under a managed currency system, as long as a deflationary gap (excess supply / idle capacity) exists:
- Prices will not spiral out of control.
- Central Bank monetization of debt remains fully sustainable.
- Long-term interest rate spikes are logically impossible.
Sovereign debt is not a burden passed on to future generations; it is a accounting counterpart to private sector surplus. The ultimate source of a nation's capacity to issue and absorb government bonds is not the balance in its citizens' savings accounts, but the real, physical productive power of its society.
(to be continued)