Mervyn King: Monetary policy – practice ahead of theory Text of the Mais Lecture 2005 by Mr Mervyn King, Governor of the Bank of England, at the Cass Business School, City University, London, 17 May 2005. The references can be found on the Bank of England’s website. I am indebted to James Proudman, Gertjan Vlieghe, Tony Yates and Richard Harrison who have worked closely with me on this lecture and are effectively co-authors. Alan Mankikar and Tim Taylor provided excellent assistance in preparing the empirical and historical research that support this lecture. *  *  *  Introduction Monetary policy is aimed at maintaining price stability. That may seem self-evident. Thirty years ago it was not. From the end of the second world war until the mid to late 1970s, the majority view of academic economists and policy-makers alike was that monetary policy had rather little to do with inflation, and was largely ineffective as an instrument of demand management.1 The intellectual basis for that view was never clear. And painful experience taught us that price instability led to costly fluctuations in real output and employment. Far from being ineffective, a monetary policy aimed at price stability has proved to be the key to successful management of aggregate demand. Fortunately, the theory and practice of monetary policy in the UK have changed out of all recognition in the past twenty-five years.2 We have moved from the Great Inflation to the Great Stability.
In this way, I trust, we can reconcile those who feel left out, including many of the protesters gathered in Frankfurt this week, with a process of integration that has already generated so many benefits for three generations of Europeans. Let me conclude. This building is a credit to all those who have worked to bring it to fruition. It is a landmark for the city of Frankfurt. And it provides the ECB with an impressive new home to pursue its mandate. But it also stands as a powerful symbol of what European integration is about. It reminds us of where we have come from and where we have come to. Of the horrors that can happen when we split apart, and the huge steps forward we can make when we work together. So let us not undo what has been achieved. Let us not hanker for the past. Let us draw on the past to unite us in the present – to build a complete Union that can deliver the stability and prosperity we need. We as the central bank will do our part in this process by ensuring the integrity of our single currency. Our shared money is the most tangible sign of the trust we place in one another. As the ECB’s first President, Wim Duisenberg, put it at the launch of the euro more than 16 years ago: “A currency is far more than just a medium of exchange … A currency is also part of the identity of people.