[2.1.2b] Monetary policy
Monetary Policy
Monetary policy refers to the use of interest rates (and other monetary tools) by a central bank to influence the level of aggregate demand in the economy and thereby achieve macroeconomic objectives — primarily low and stable inflation, but also supporting growth and employment.
In the UK, monetary policy is set by the Bank of England's Monetary Policy Committee (MPC), which meets eight times per year to decide the base interest rate. The MPC targets 2% CPI inflation. Central bank independence from government — introduced in 1997 — is designed to prevent short-term political pressures from distorting interest rate decisions.
How Interest Rates Affect the Economy
The base interest rate — set by the central bank — feeds through into the interest rates banks charge on loans and pay on savings. Changes in interest rates affect households, businesses and the exchange rate through several transmission channels:
Rate rise → lower consumer spending: higher interest rates increase the cost of borrowing on mortgages, personal loans and credit cards. Households with variable-rate mortgages face higher monthly payments, leaving less disposable income for other spending. The cost of taking on new debt rises, discouraging major purchases (cars, home improvements). Consumer spending falls — reducing aggregate demand.
Rate cut → higher consumer spending: cheaper borrowing encourages households to take on mortgages and consumer credit. Monthly mortgage payments fall, freeing up income. This stimulates spending, raising aggregate demand and supporting economic growth.
Rate rise → lower business investment: higher interest rates increase the cost of borrowing to finance investment projects — new machinery, factory expansion, R&D. Projects that were viable at lower rates may no longer cover their financing costs. Businesses also face higher opportunity costs — money retained in savings earns more, so investment must yield a higher return to be worthwhile. Capital investment falls, reducing aggregate demand and long-run productive capacity.
Rate cut → higher business investment: cheaper borrowing makes previously marginal projects profitable. Firms invest more in capital, raising productive capacity and aggregate demand simultaneously.
Rate rise → more saving: higher interest rates increase the return on savings — households earn more interest on deposits. This increases the incentive to save rather than spend, reducing current consumption. It also benefits savers (typically older households) at the expense of borrowers.
Rate cut → less saving: lower returns on deposits make saving less attractive — the opportunity cost of spending falls. Households are more likely to spend rather than save, boosting aggregate demand. Those living off savings income see their returns fall, potentially reducing their spending.
Rate rise → stronger exchange rate: higher domestic interest rates attract foreign financial capital seeking better returns. Investors buy the domestic currency to invest in domestic assets — increasing demand for the currency and pushing up its value (appreciation). A stronger currency makes imports cheaper and exports more expensive, reducing net exports and dampening inflation through cheaper import prices.
Rate cut → weaker exchange rate: lower returns discourage foreign investment. Demand for the domestic currency falls, depreciating it. Exports become cheaper abroad (improving competitiveness); imports become more expensive (contributing to import-cost inflation).
Rate rise → lower inflation: by reducing consumer spending, business investment and the exchange rate channel (cheaper imports), higher rates dampen aggregate demand — easing demand-pull inflation. The full effect typically takes 12–18 months to work through the economy.
Rate cut → higher inflation: stimulating aggregate demand risks demand-pull inflation if the economy is near full capacity. Currency depreciation following rate cuts also causes imported inflation as import prices rise.
Monetary Policy and Macroeconomic Objectives
| Objective | Interest rate rise (tightening) | Interest rate cut (loosening) |
|---|---|---|
| Inflation | Reduces aggregate demand → eases demand-pull inflation. Most effective tool for this objective | Stimulates demand → may raise inflation if near full capacity |
| Economic growth | Reduces consumer spending and investment → slows growth | Stimulates spending and investment → boosts growth during downturns |
| Unemployment | Slows growth → may increase unemployment | Boosts growth → creates jobs and reduces cyclical unemployment |
| Current account | Appreciates currency → worsens trade balance (exports more expensive, imports cheaper) | Depreciates currency → improves trade competitiveness |
Limitations of Monetary Policy
- Time lags: changes in interest rates take 12–18 months to fully feed through to spending, investment and inflation — making precise calibration difficult.
- Zero lower bound: interest rates cannot be cut much below zero without perverse effects. When rates are already at or near zero (as in many economies post-2008), conventional monetary policy loses effectiveness — the reason central banks turned to quantitative easing (creating money to buy assets).
- Cost-push inflation: higher interest rates reduce demand but cannot fix supply-side price shocks (e.g. oil price rises). Using rates to combat cost-push inflation risks unnecessary unemployment.
- Confidence: if households and businesses are very pessimistic, even low interest rates may not stimulate spending — the "pushing on a string" problem.
Key Takeaways
- Monetary policy = central bank use of interest rates to manage aggregate demand and inflation.
- Rate rise: reduces consumer spending, discourages investment, encourages saving, appreciates currency, lowers inflation.
- Rate cut: boosts consumer spending, encourages investment, discourages saving, depreciates currency, raises inflation.
- Primary objective: low and stable inflation (2% CPI target in UK). Secondary objectives: supporting growth and employment.
- Limitations: time lags, zero lower bound, ineffective against cost-push inflation and weak when confidence is very low.