Monetary policy

Step 1. Apply the real interest rate relationship. Real interest rate = nominal interest rate - rate of inflation = 3.5% - 5.1%.

Step 2. Complete the subtraction, keeping the sign. 3.5 - 5.1 = -1.6%. The real interest rate is negative.

Step 3. Interpret it. The saver's balance grows by 3.5% over the year, but the prices of the things they want to buy rise by 5.1%. The money in the account buys 1.6% less at the end of the year than at the start, so the saver has lost purchasing power despite receiving interest.

Step 4. Draw the wider consequence. A negative real interest rate rewards borrowing and penalises saving, because the real value of a debt is being eroded at the same time. This is why the real rate, not the nominal rate, determines behaviour.

Candidates lose marks by dropping the minus sign or by answering that the saver has gained because they received interest. Always state whether the real rate is positive or negative and say what that means for purchasing power.

Step 1. Calculate the money multiplier. Money multiplier = 1 / reserve ratio = 1 / 0.10 = 10.

Step 2. Calculate the maximum increase in deposits. Total change in deposits = $500m x 10 = $5,000 million, or $5 billion.

Step 3. Separate the new lending from the original injection. Of the $5,000m of deposits, $500m is the original injection. The remaining $4,500m has been created by the banking system through successive rounds of lending and redepositing.

Step 4. Explain why the outcome is normally smaller. The figure is a maximum, not a prediction. It assumes banks lend out every dollar above their reserve requirement and that every loan returns to the banking system as a deposit. In practice banks hold excess reserves when they judge lending risky, households and firms hold some money as cash outside the system, and in a downturn creditworthy borrowers may simply not want to borrow at any rate on offer.

Step 5. Draw the policy conclusion. The central bank controls the reserves it supplies, but not the willingness of banks to lend or of firms to borrow. Expanding the monetary base therefore guarantees no particular expansion of the money supply, which is exactly the difficulty quantitative easing encountered and the reason its effects were debated.

Step 4 is where the marks separate. A candidate who produces $5 billion and stops has done arithmetic; one who explains that it is an upper bound and why has produced evaluation that transfers straight into an essay.

A, C, D, H, B, E, F, G

1. The central bank raises its policy rate in response to inflation above target.
2. Commercial banks raise lending and deposit rates, since their own cost of funds has risen.
3. Borrowing becomes more expensive and saving more rewarding, so households postpone consumption, particularly of durables bought on credit.
4. Firms face a higher cost of capital, so marginal investment projects no longer clear their required rate of return and investment falls.
5. Higher domestic rates attract financial inflows, demand for the currency rises and it appreciates.
6. Appreciation makes exports dearer abroad and imports cheaper at home, so net exports fall.
7. Consumption, investment and net exports have all fallen, so aggregate demand shifts left.
8. The price level rises more slowly, so the inflation rate falls, at the cost of lower output and higher unemployment in the short run.

AO2 analysis is 40% of the written papers. Note that three separate AD components move here, and the exchange rate channel is the one candidates most often omit. Including it is a cheap way to lift an answer.

H, G, C, B, F, A, E, D

1. The government cuts taxes to support growth, so aggregate demand rises.
2. Rising demand adds to inflationary pressure, particularly if the economy is near capacity.
3. The central bank, holding an inflation target and acting independently, raises the policy rate in response.
4. Higher rates reduce consumption and investment, offsetting part of the fiscal expansion.
5. Higher rates also raise the government's cost of servicing its debt, worsening the budget position the tax cut already weakened.
6. Higher domestic rates attract capital inflows and the currency appreciates.
7. Appreciation reduces net exports, which offsets the fiscal expansion again and worsens the current account.
8. The net effect on output may be small while the currency is stronger, the deficit larger and debt servicing dearer than before either policy acted.

This chain is the answer to a question your Paper 4 bank asks directly, about US tax reductions in January 2018 alongside a Federal Reserve signalling higher rates. Policy conflict questions are common at A Level and reward candidates who can trace the offsetting mechanism rather than assert that the policies 'contradict'.

Define and frame: Define recession as two consecutive quarters of falling real GDP, and monetary policy by its instruments and its operator. Identify the claim's two separate assertions: that monetary policy works against recession, and that nothing else does. Say you will test both, and that the answer depends on how deep the recession is and on where interest rates already stand.

Analysis: the case for: Run the transmission chain in the expansionary direction, from a rate cut through cheaper borrowing to consumption and investment, plus depreciation raising net exports. Support with an AD/AS diagram on a flat AS section, where the shift buys real output cheaply in price terms. Add monetary policy's genuine advantages: short recognition and implementation lags, and reversibility, neither of which fiscal policy has.

Analysis: why 'only' fails: Attack the exclusivity claim directly, since that is where the marks are. At the zero lower bound the instrument is exhausted, and in a liquidity trap extra money is held rather than spent. Monetary policy relies on the private sector choosing to borrow, which is precisely what collapses in a recession, whereas government spending is a direct injection that requires no such consent. Supply-side measures address structural unemployment that neither demand policy touches.

Evaluation: Weigh rather than list. Set monetary policy's speed of implementation against its long impact lag of one to two years. Set fiscal policy's directness against its slow implementation and its debt consequences. Note that quantitative easing partly answers the lower-bound objection but has uncertain transmission and regressive distributional effects. Note too that the instruments are not really independent, since fiscal expansion financed by borrowing may prompt a monetary tightening that cancels it.

Judgement: Reject 'only' while conceding the underlying point, and make the conclusion conditional. Monetary policy is usually the first and fastest response and is often sufficient for a shallow recession with rates well above zero. It is insufficient where rates are already at the floor, where confidence is so weak that cheaper credit goes untaken, or where the downturn is structural rather than cyclical. In those cases fiscal policy is not merely an alternative but a necessity. A conclusion that specifies which conditions decide the matter reaches the top band; one that says 'a combination is best' without saying when does not.