When the Bank of England changes the official interest rate it is attempting to influence the overall level of expenditure in the economy. When the amount of money spent grows more quickly than the volume of output produced, inflation is the result. The BOE therefore uses an increase or decrease in interest rates to control inflation, by trying to control the amount that is spent in the ecomomy. The basic idea is that the higher the rate of interest the more likely we are to save rather than to spend.

The Bank of England sets an interest rate at which it lends to financial institutions. This interest rate then affects the whole range of interest rates set by commercial banks, building societies and other institutions for their own savers and borrowers. It also tends to affect the price of financial assets, such as bonds and shares, and the exchange rate, which affect consumer and business demand in a variety of ways. Lowering or raising interest rates affects spending in the economy.

A reduction in interest rates makes saving less attractive and borrowing more attractive, which stimulates spending. Lower interest rates can affect consumers’ and firms’ cash-flow – a fall in interest rates reduces the income from savings and the interest payments due on loans. Borrowers tend to spend more of any extra money they have than lenders, so the net effect of lower interest rates through this cash-flow channel is to encourage higher spending in aggregate. The opposite occurs when interest rates are increased.

Lower interest rates can boost the prices of assets such as shares and houses. Higher house prices enable existing home owners to extend their mortgages in order to finance higher consumption. A trend which we have seen a lot of during the past decade. Higher share prices raise households’ wealth and can increase their willingness to spend.

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Changes in interest rates can also affect the exchange rate. An unexpected rise in the rate of interest in the UK relative to overseas would give investors a higher return on UK assets relative to their foreign-currency equivalents, tending to make sterling assets more attractive. That should raise the value of sterling, reduce the price of imports, and reduce demand for UK goods and services abroad. However, the impact of interest rates on the exchange rate is, unfortunately, seldom that predictable.

Changes in spending feed through into output and, in turn, into employment. That can affect wage costs by changing the relative balance of demand and supply for workers. But it also influences wage bargainers’ expectations of inflation – an important consideration for the eventual settlement. The impact on output and wages feeds through to producers’ costs and prices, and eventually consumer prices.

Some of these influences can work more quickly than others. And the overall effect of monetary policy will be more rapid if it is credible. But, in general, there are time lags before changes in interest rates affect spending and saving decisions, and longer still before they affect consumer prices.

We cannot be precise about the size or timing of all these channels. But the maximum effect on output is estimated to take up to about one year. And the maximum impact of a change in interest rates on consumer price inflation takes up to about two years. So interest rates have to be set based on judgments about what inflation might be – the outlook over the coming few years – not what it is today.

Setting interest rates

As banker to the Government and the banks, the Bank is able to forecast fairly accurately the pattern of money flows between the Government's accounts on one hand and the commercial banks on the other, and acts on a daily basis to smooth out the imbalances which arise. When more money flows from the banks to the Government than vice versa, the banks' holdings of liquid assets are run down and the money market finds itself short of funds. When more money flows the other way, the market can be in cash surplus. In practice the pattern of Government and Bank operations usually results in a shortage of cash in the market each day.

The Bank supplies the cash which the banking system as a whole needs to achieve balance by the end of each settlement day. Because the Bank is the final provider of cash to the system it can choose the interest rate at which it will provide these funds each day. The interest rate at which the Bank supplies these funds is quickly passed throughout the financial system, influencing interest rates for the whole economy. When the Bank changes its dealing rate, the commercial banks change their own base rates from which deposit and lending rates are calculated.

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