3.5 Demand management - monetary policy

Monetary policy uses interest rates, money conditions and expectations to influence inflation, output, employment and exchange rates.

Central-bank transmission works through borrowing, saving, asset prices, expectations and exchange rates with time lags.

Name the target and trace the channel.

A rate rise can reduce borrowing and demand, lowering inflation after a lag.

Policy affects several objectives and may have distributional effects.

Monetary policy is the central bank's control or influence over the money supply and interest rates. Its goals include low and stable inflation (often through an inflation target), low unemployment, smoother business-cycle fluctuations, a stable environment for long-run growth and external balance. Because one decision can affect several goals, state the targeted objective and possible conflict—for example, tighter policy may reduce inflation but temporarily lower output and employment.

The nominal interest rate is the stated rate; the real rate adjusts for inflation and approximates purchasing-power cost.

For moderate rates, real rate ≈ nominal rate minus inflation; expectations matter for decisions.

State whether ex ante or ex post and compare rates consistently.

A 6% nominal loan with 4% inflation has an approximate real cost of 2%.

A high nominal rate can coexist with a low or negative real rate.

Expansionary policy lowers rates or eases money to support demand; contractionary policy raises rates or tightens conditions to reduce inflationary pressure.

The effect depends on confidence, debt, exchange rates and spare capacity.

Match policy direction to the macro problem and identify the trade-off.

During a demand slump, lower rates may support investment; near capacity they may add inflation.

Policy direction alone does not guarantee the intended outcome.

For a deflationary/recessionary gap, expansionary policy lowers rates or eases money conditions, encouraging consumption and investment (and often net exports through depreciation), shifting AD right toward potential output. For an inflationary gap, contractionary policy raises rates or tightens conditions, shifting AD left. Draw the initial and new AD with SRAS and the relevant full-employment benchmark; the price-level and real-output effects depend on spare capacity and the AS model.

Monetary policy effectiveness depends on transmission strength, timing, credibility, financial conditions and the cause of the shock.

Liquidity traps, weak banks, high debt, supply shocks and uncertain expectations can weaken or reverse effects.

State the constraint and evidence before judging effectiveness.

Rate cuts may not raise spending if households are repairing debt and banks restrict lending.

A policy can be appropriate yet ineffective under current conditions.

Strengths include small incremental changes, flexibility, easy reversibility and relatively short decision/implementation lags. Constraints include little room to cut nominal rates near zero and weak consumer or business confidence that suppresses borrowing and spending. Transmission may also vary with debt, banks and exchange rates. Judge success separately for growth, unemployment and price stability: easing can be potent against weak AD with functioning credit, but less effective near zero or against cost-push inflation, where extra AD may worsen prices.