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How do money and bank lending work?

Money functions as a means of payment, a unit of account and a store of value. In modern banking systems, making a loan commonly creates a matching deposit. This expands both a bank asset and a bank liability. It does not create unlimited free wealth. Lending is constrained by capital, funding and liquidity conditions, risk, regulation and creditworthy demand. Central bank reserves and customer deposits are different balance sheet items.

Monetary transmission

A policy rate change can influence money market rates, loan pricing, asset prices, exchange rates and expectations. These affect spending and investment with uncertain delays. Banks may tighten credit even without a new policy rate increase. Fixed rate debt, borrower balance sheets and the exchange rate regime change how strongly policy reaches the economy. Central bank mandates and operating tools differ across jurisdictions.

Real rates and expectations

For a matched period, an approximate real interest rate equals the nominal rate minus expected inflation. The exact relation is (1 + nominal rate) / (1 + inflation rate) minus 1. With a nominal rate of 5% and expected inflation of 3%, the exact expected real rate is about 1.94%. Using realized inflation gives the real interest rate measured after the period ends. Do not mix a short term interest rate with an unrelated long horizon inflation forecast.

Fiscal policy and public finances

Fiscal policy changes public spending, taxation and transfers. Automatic stabilizers, such as tax receipts falling during a downturn, operate without a new discretionary measure. A deficit is a flow over a period. Debt is a stock at a date. The primary balance excludes interest payments. Sustainability depends on financing costs, growth, maturity, currency, credibility, assets and contingent liabilities. A ratio of debt to GDP alone is insufficient.

Policies can interact

Government support can sustain demand while monetary tightening restrains it. The effect depends on who receives support, available productive capacity and how it is financed. Public investment can influence capacity over time, while some subsidies alter incentives or impose persistent costs. Separate announced budgets from actual execution.

Practice the transmission chain

For a hypothetical rate increase, trace a household with a floating rate mortgage, a firm refinancing next month and a firm with fixed rate funding for five years. Their immediate cash flow effects differ. List the evidence needed, such as loan terms, credit growth, lending standards and spending, before concluding how the whole economy will respond.

Sources and further reading

Examples use hypothetical figures unless stated otherwise. Updated 8 October 2026.