Creditism: The Economy Built on Debt

Economic activity is usually described through GDP, consumption, investment, inflation and employment. These aggregates remain essential, but behind them lies a system of credit relationships. Households borrow to buy homes. Companies borrow to invest, acquire and finance working capital. Governments issue bonds to finance deficits and refinance maturing obligations. Banks create credit and connect borrowers to the wider financial system, and investors and financial institutions use collateral and funding markets to manage their balance sheets.

The scale is large. According to the IMF Global Debt Database, global public and private debt together stood at just over 235% of world GDP in 2024, with private debt slightly under 143% and public debt nearly 93%. Credit allows decisions to be taken today against expected future income: a household buys a property before it has saved the price, a firm builds a plant before the revenues arrive, a government finances infrastructure over time rather than from current taxes.

This ability to bring future purchasing power into the present is one of the defining features of financial capitalism. It also introduces an asymmetry. Credit can accelerate activity today while creating obligations that must be serviced tomorrow, so the mechanism that supports expansion can also generate fragility.

Lesson 2 showed that when a bank lends it records an asset (the borrower’s obligation to repay) and a liability (the deposit credited to the borrower). The borrower gains purchasing power and assumes a contractual obligation; the bank holds a claim.

What happens next is the crucial step. The borrower spends the deposit, and the payment moves it to another account. The loan, however, stays outstanding until it is repaid, written off or restructured. Creating money through credit does not remove the debt that accompanies it.

The money supply can expand through lending, but each expansion changes the structure of private-sector balance sheets. To understand the economy it is not enough to know how much money exists; one needs to know who owes what to whom, at what interest rate, under which contractual terms and against which sources of future income.

Credit is not inherently destabilising. It is the mechanism through which much productive investment is financed, it lets households smooth consumption, and it lets governments fund assets whose benefits last across generations. What matters is the relationship between new borrowing, productive capacity, asset valuations and future cash flows. Two simplified cases illustrate the contrast.

The distinction is not absolute. Property investment can support productive activity, financial assets can facilitate capital allocation, and not every rise in asset prices is a bubble. The point is directional: when credit finances productivity-enhancing investment it can strengthen the economy’s ability to service debt; when it increasingly finances price appreciation, refinancing or spending that does not generate sufficient future income, vulnerabilities can accumulate.

Debt must be analysed from both sides. For the borrower it is a liability; for the creditor it is a financial asset. A government bond is a liability of the state and an asset of its holder. A mortgage is a liability of the household and an asset of the bank or investor that owns the claim. Debt is therefore not just a measure of what an economy owes; it is a map of financial relationships. Who holds the claims, who must make the payments, which institutions depend on that income, and what happens if payments are delayed?

In a consolidated domestic economy many claims are matched by liabilities within the same economy, so they do not represent net financial wealth for the domestic private sector as a whole. That does not make debt irrelevant. Distribution matters: a household with a large mortgage and limited income is not in the position of a pension fund holding the corresponding security, a highly leveraged bank is not a well-capitalised creditor, and a government with concentrated refinancing needs has less flexibility than one with a favourable maturity profile. Claims and liabilities may offset in accounting, but their holders differ in liquidity needs, risk exposure and spending behaviour.

The external dimension adds a further layer. Claims held by non-residents, and liabilities owed to them, make the location of a debt within the balance-sheet network as important as its aggregate size. This is developed in Parts III and VII.

A credit economy contains several kinds of borrower, and the distinction between private and public debt is central.

In simplified terms, the debt-to-GDP ratio rises when the effective interest rate exceeds nominal growth, and it falls when growth is higher, other things equal, with the primary balance adding to or subtracting from the change. A government that borrows in a currency it does not control faces different constraints from an issuer of its own currency. Even the latter faces limits from inflation, market confidence, institutions, external constraints and the productive capacity of its economy.

Public and private debt also interact. In a recession, households and firms reduce borrowing and spending, tax revenues weaken and transfers rise, so deficits widen as the private sector repairs its balance sheets. Public borrowing can help stabilise demand in that process, but the higher public debt does not by itself resolve private-sector weakness. The outcome depends on the scale, composition and effectiveness of fiscal support and on subsequent growth and financing conditions. The essential question is not whether debt is public or private but who can service it, under what conditions, and with what consequences if those conditions change.

Debt is often discussed through ratios: debt to GDP, household debt to income, corporate leverage. They are useful indicators of exposure, but they do not determine whether a borrower can pay. Debt service depends on cash flow: wages, business profits, tax revenues, investment income or the proceeds of refinancing. A company with substantial assets can fail for lack of cash, a household owning a valuable property can default after losing a job, and a government with a moderate debt ratio can come under pressure if refinancing costs jump, maturities cluster or nominal growth weakens.

Refinancing can postpone the repayment of principal in cash, but it does not make the obligation disappear: it replaces one financing arrangement with another, possibly at a different rate or on different conditions. This is why the maturity structure matters. A borrower with long-term fixed-rate financing is relatively insulated from an immediate rise in market rates; one that depends on short-term or floating-rate funding sees cash flow deteriorate much faster. The same monetary tightening therefore reaches borrowers at very different speeds.

Interest rates affect the cost of new borrowing and, depending on contract terms and refinancing, the cost of servicing existing debt. When rates rise, several channels operate at once. New mortgages become dearer, companies face higher hurdle rates for investment, governments refinance maturing bonds at higher yields, banks reassess lending standards and borrower risk, and property and other asset prices adjust as discount rates rise.

The result depends on the structure of existing debt. Fixed-rate borrowers feel the effect only as they refinance; floating-rate borrowers feel it almost immediately. As debt-service costs rise, households have less disposable income, firms may cut investment or employment, borrowers may sell assets, and lenders become more cautious. These responses reinforce one another: lower spending weakens revenue, which weakens debt-servicing capacity, which worsens credit quality and tightens lending. The process is neither automatic nor uniform. Strong employment, rising nominal incomes, fixed-rate financing, fiscal support or falling inflation can cushion it.

The link between debt and activity becomes dangerous when falling prices or incomes raise the real burden of existing obligations. The mechanism is associated with Irving Fisher’s analysis of debt-deflation in the 1930s. Consider an economy in which households and firms have built up debt during a period of rising asset prices. A shock weakens revenue and confidence, asset prices fall, credit becomes harder to obtain and borrowers try to reduce their debt. To do so, households cut consumption and firms cut investment, sell assets or dismiss workers. Each action may be individually rational, but when many borrowers act together aggregate demand weakens.

Lower demand reduces revenue; firms cut prices, wages, output and employment; nominal incomes decline, which makes fixed nominal debts harder to service. Defaults rise, banks record losses and lenders tighten credit, while falling asset prices reduce collateral values and limit new financing. The problem is not that prices are falling in itself, but that nominal debts stay fixed, or adjust more slowly than the incomes that service them. Debt burdens can rise even if the nominal amount of debt does not.

Traditional business-cycle analysis tracks output, employment, consumption, investment and inflation. These remain indispensable, but they may not reveal the dynamics of a credit-driven economy, because credit can amplify the cycle. In an expansion, rising incomes and asset prices improve apparent creditworthiness, banks lend more, collateral values rise and borrowers gain access to more financing, which supports spending and growth. The same process can lead leverage to rise, underwriting standards to loosen and asset prices to move beyond levels justified by expected cash flows, so the expansion can sow fragility. When conditions reverse, asset prices fall, collateral shrinks, lenders reassess risk and borrowers cut spending to repair balance sheets, and the downturn can be deeper than the initial shock implied.

This is why financial crises are not simply ordinary recessions with larger falls in GDP. They can involve a restructuring of the balance-sheet relationships on which activity depends, and the evidence from long historical samples is that recoveries from credit-driven downturns tend to differ from those of other recessions.

The interaction between borrowers’ balance sheets and their access to financing is often described through the financial accelerator, developed in the work of Bernanke, Gertler and Gilchrist. When conditions improve, incomes and collateral values rise, perceived risk falls and external finance becomes cheaper or easier to obtain, which supports further spending and reinforces the expansion. When conditions deteriorate, lower income and collateral raise the cost of external finance or restrict it, borrowers cut spending and activity weakens further, putting more pressure on balance sheets.

The financial system therefore does more than transmit shocks; under certain conditions it amplifies and propagates them. The mechanism is strongest when leverage is high, valuations depend on continued credit availability, and borrowers or lenders rely on refinancing. It also explains why modest changes in rates, collateral values or confidence can sometimes have disproportionate effects.

Credit relationships cross borders. Banks lend internationally, companies issue debt in foreign markets, investors hold foreign bonds, and governments and central banks hold foreign assets. A claim held by a non-resident, or a liability denominated in a foreign currency, changes how a debt behaves under stress, because the borrower’s income may be in one currency and its obligation in another.

The BIS global liquidity indicators measure this. At end-March 2026, US dollar credit to borrowers outside the United States stood at $14.7 trillion, of which about 30% was owed by emerging-market and developing-economy borrowers. Euro credit to borrowers outside the euro area was €5.1 trillion, with around 17% owed by such borrowers. Over the year, dollar and euro foreign-currency credit grew 7.3% and 12% respectively. The implication is that domestic credit conditions can be shaped by financial conditions in the currency in which borrowing takes place, which is the subject of Parts III and VII.

The lesson can be condensed into a short set of questions that apply to a household, a firm, a bank, a government or a country.

None of the six questions assumes that debt is harmful. Their purpose is to distinguish credit that builds capacity and can be serviced from credit that depends on rising asset prices, continued refinancing or favourable external conditions.

• Irving Fisher, “The Debt-Deflation Theory of Great Depressions”, Econometrica, 1933.
• Ben Bernanke, Mark Gertler and Simon Gilchrist, “The Financial Accelerator in a Quantitative Business Cycle Framework”, Handbook of Macroeconomics, 1999.
• Òscar Jordà, Moritz Schularick and Alan Taylor, “When Credit Bites Back”, Journal of Money, Credit and Banking, 2013.
• Hyman Minsky, Stabilizing an Unstable Economy, and Charles Kindleberger, Manias, Panics, and Crashes, both in the Reading Room.