Downing Street Years - Margaret Thatcher [428]
If the money supply rises too fast, the prices of non-tradeable domestic goods will rise accordingly, and a strong pound will not prevent that. But the interaction of a strong pound and a loose money supply causes the export sector to be depressed, resources to flow to houses, restaurants and the like. The balance of trade will then go into larger and larger deficits, which have to be financed by borrowing from foreigners. This kind of distortion just cannot last. Either the exchange rate has to come down, or monetary growth has to be curtailed, or both.
This result is of the utmost importance. Either one chooses to hold an exchange rate to a particular level, whatever monetary policy is needed to maintain that rate. Or one sets a monetary target, allowing the exchange rate to be determined by market forces. It is, therefore, quite impossible to control both the exchange rate and monetary policy.
A free exchange rate, however, is fundamentally influenced by monetary policy. The reason is simple. If a lot more pounds are put into circulation, then the value of the pound will tend to fall — just as a glut of strawberries will cause their value to go down. So a falling pound may indicate that monetary policy has been too loose.
But it may not. There are many factors other than the money supply which have a great influence on a free exchange rate. The most important of these are international capital flows. If a country reforms its tax, regulatory and trade union arrangements so that its after-tax rate of return on capital rises well above that of other countries, then there will be a net inflow of capital and its currency will be in considerable demand. Under a free exchange rate, it would appreciate. But this would not be a sign of monetary stringency: indeed, as in Britain in 1987 to mid-1988, a high exchange rate may well be associated with a considerable monetary expansion.
It follows from this that if the exchange rate becomes an objective in itself, as opposed to one indicator among others for monetary policy, ‘monetarism’ itself has been abandoned. It is worth repeating the point because it is of such importance to understanding the arguments which took place: you can either target the money supply or the exchange rate, but not both. It is an entirely practical issue. The only effective way to control inflation is by using interest rates to control the money supply. If, on the contrary, you set interest rates in order to stick at a particular exchange rate you are steering by a different and potentially more wayward star. As we have now seen twice — once when, during my time, Nigel shadowed the deutschmark outside the ERM and interest rates stayed too low; once when, under John Major, we tried to hold to an unrealistic parity inside the ERM and interest rates stayed too high — the result of plotting a course by this particular star is that you steer straight on to the reefs.
ECONOMIC AND MONETARY UNION (EMU)
These questions were not ones for the technicians alone: they went to the very heart of economic policy, which itself lies at the heart of democratic politics. But there was an even more important issue which was raised first by argument about whether sterling should join the ERM and then, in a more acute form, about whether we should accept European Community proposals for Economic and Monetary Union (EMU). This was the issue of sovereignty. Sterling