Each day many investors anxiously watch the stock market to see if their shares have gone up or down. They may also speculate: buying if they think share prices are likely to go up; selling if they think their shares will fall. But what drives these expectations?
To some extent, people will look at real factors, such as company sales and profits or macroeconomic indicators, such as the rate of economic growth or changes in public-sector borrowing. But to a large extent people are trying to predict what other people will do: how other people will react to changes in various indicators.
John Maynard Keynes observed this phenomenon in Chapter 12 of his General Theory of Employment, Interest and Money of 1936. He likened this process of anticipating what other people will do to a newspaper beauty contest, popular at the time. In fact, behaviour of this kind has become known as a Keynesian beauty contest (see also).
Keynes wrote that:
professional investment may be likened to those newspaper competitions in which the competitors have to pick out the six prettiest faces from a hundred photographs, the prize being awarded to the competitor whose choice most nearly corresponds to the average preferences of the competitors as a whole; so that each competitor has to pick, not those faces which he himself finds prettiest, but those which he thinks likeliest to catch the fancy of the other competitors, all of whom are looking at the problem from the same point of view. It is not a case of choosing those which, to the best of one’s judgement, are really the prettiest, nor even those which average opinion genuinely thinks the prettiest. We have reached the third degree where we devote our intelligences to anticipating what average opinion expects the average opinion to be. And there are some, I believe, who practise the fourth, fifth and higher degrees.
When investors focus on people’s likely reactions, it can make markets very unstable. A relatively minor piece of news can cause people to buy or sell in anticipation that others will do the same and that others will realise this and do the same themselves. Markets can overshoot, until, when prices have got out of line with fundamentals, buying can turn into selling, or vice versa. Prices can then move rapidly in the other direction, again driven by what people think other people will do. Sometimes, markets can react to very trivial news indeed. As the New York Times article below states:
On days without much news, the market is simply reacting to itself. And because anxiety is running high, investors make quick, sometimes impulsive, responses to relatively minor events.
The rise of the machine
In recent years there is a new factor to account for growing stock market volatility. The Keynesian beauty contest is increasingly being played by computers. They are programmed to buy and sell when certain conditions are met. The hundreds of human traders of the past who packed trading floors of stock markets, have been largely replaced by just a few programmers, trained to adjust the algorithms of the computers their finance companies use as trading conditions change.
And these computers react in milliseconds to what other computers are doing, which in turn react to what others are doing. Markets can, as a result, suddenly soar or plummet, until the algorithms kick the market into reverse as computers sell over-priced stock or buy under-priced stock, which triggers other computers to do the same.
Robot trading is here to stay. The articles and podcast consider the implications of the ‘games’ they are playing – for savers, companies and the economy.
Articles
Questions
- Give some other examples of human behaviour which is in the form of a Keynesian beauty contest.
- Why may playing a Keynesian beauty contest lead to an undesirable Nash equilibrium?
- Does robot trading do anything other than simply increase the speed at which markets adjust?
- Can destabilising speculation continue indefinitely? Explain.
- Explain what is meant by ‘overshooting’? Why is overshooting likely to occur in stock markets and foreign exchange markets?
- In what ways does robot trading (a) benefit and (b) damage the interests of savers?
Since the beginning of 2009, central banks around the world have operated an extremely loose monetary policy. Their interest rates have been close to zero (click here for a PowerPoint of the chart) and more than $20 trillion of extra money has been injected into the world economy through various programmes of quantitative easing.
The most recent example of loose monetary policy has been in Japan, where substantial quantitative easing has been the first of Japan’s three arrows to revive the economy (the other two being fiscal policy and supply-side policy).
One consequence of a rise in money supply has been the purchase of a range of financial assets, including shares, bonds and commodities. As a result, despite the sluggish or negative growth in most developed countries, stock markets have soared (see chart). From March 2009 to May 2013, the FTSE 100 rose by 91% and both the USA’s Dow Jones Industrial average and Germany’s DAX rose by 129%. Japan’s NIKKEI 225, while changing little from 2009 to 2012, rose by 78% from November 2012 to May 2013 (click here for a PowerPoint of the chart).
The US economy has been showing stronger growth in recent months and, as a result, the Fed has indicated that it may soon have to begin tightening monetary policy. It is not doing so yet, nor are other central banks, but the concern that this may happen in the medium term has been enough to persuade many investors that stock markets are likely to fall as money eventually becomes tighter. Given the high degree of speculation on stock markets, this has led to a large-scale selling of shares as investors try to ‘get ahead of the curve’.
From mid-May to mid-June, the FTSE 100 fell by 6.2%, the Dow Jones by 2.6%, the DAX by 4.5% and the NIKKEI by 15%. In some developing countries, the falls have been steeper as the cheap money that entered their economies in search of higher returns has been leaving. The falls in their stock markets have been accompanied by falls in their exchange rates.
The core of the problem is that most of the extra money that was created by central banks has been used for asset purchase, rather than in financing extra consumer expenditure or capital investment. If money is tightened, it is possible that not only will stock and bond markets fall, but the fragile recovery may be stifled. In other words, tighter money and higher interest rates may indeed affect the real economy, even though loose monetary policy and record low interest rates had only a very modest effect on the real economy.
This poses a very difficult question for central banks. If even the possibility of monetary tightening some time in the future has spooked markets and may rebound on the real economy, does that compel central banks to maintain their loose policy? If it does, will this create an even bigger adjustment problem in the future? Or could there be a ‘soft landing’, whereby real growth absorbs the extra money and gradually eases the inflationary pressure on asset markets?
Articles
How the Fed bosses all BBC News, Robert Peston (12/6/13)
The great reversal? Is the era of cheap money ending? BBC News, Linda Yueh (12/6/13)
The Great Reversal: Part II (volatility and the real economy) BBC News, Linda Yueh (14/6/13)
The end of the affair The Economist (15/6/13)
Out of favour The Economist, Buttonwood (8/6/13)
The Federal Reserve: Clearer, but less cuddly The Economist (22/6/13)
Global financial markets anxious to avoid many pitfalls of ‘political risk’ The Guardian, Heather Stewart (13/6/13)
Dow Falls Below 15,000; Retailers Add to Slump New York Times, (12/6/13)
Global market sell-off over stimulus fears The Telegraph, Rachel Cooper (13/6/13)
Nikkei sinks over 800 points, falls into bear market Globe and Mail (Canada), Lisa Twaronite (13/6/13)
Global shares drop, dollar slumps as rout gathers pace Reuters, Marc Jones (13/6/13)
The G8, the bond bubble and emerging threats BBC News, Stephanie Flanders (17/6/13)
Global monetary policy and the Fed: vive la difference BBC News, Stephanie Flanders (20/6/13)
The Federal Reserve’s dysfunctional relationship with the markets The Guardian, Heidi Moore (19/6/13)
Global stock markets in steep falls after Fed comment BBC News (20/6/13)
Federal Reserve’s QE withdrawal could signal real trouble ahead The Guardian, Nils Pratley (20/6/13)
Central banks told to head for exit Financial Times, Claire Jones (23/6/13)
Stimulating growth threatens stability, central banks warn The Guardian (23/6/13)
BIS Press Release and Report
Making the most of borrowed time: repair and reform the only way to growth, says BIS in 83rd Annual Report BIS Press Release (23/6/13)
83rd BIS Annual Report 2012/2013 Bank for International Settlements (23/6/13)
Data
Yahoo! Finance: see links for FTSE 100, DAX, Dow Jones, NIKKEI 225
Link to central bank websites Bank for International Settlements
Statistical Interactive Database – Interest & exchange rates data Bank of England
Questions
- Why have stock markets soared in recent years despite the lack of economic growth?
- What is meant by ‘overshooting’? Has overshooting taken place in stock markets (a) up to mid-May this year; (b) since mid-May? How would you establish whether overshooting has taken place?
- What role is speculation currently playing in stock markets? Would you describe this speculation as destabilising?
- What has been the impact of quantitative easing on (a) bond prices; (b) bond yields?
- Argue the case for and against central banks continuing with the policy of quantitative easing for the time being.
- Find out how much the Indian rupee and the Brazilian real have fallen in recent weeks. Explain your findings.
From the end of January to the beginning of March, the sterling exchange rate index fell by over 6% – from 81.7 to 76.5. Against the dollar, the fall has been even more dramatic, falling from $1.62 to $1.49 (a fall of 8%). What are the reason for this? And is the depreciation likely to continue? The following clip looks at what has been going on and whether the reasons are political, or whether there are other economic fundamentals that have contributed to sterling’s fall.
Stephanie Flanders on the pound BBC Politics Show, Jo Coburn and Stephanie Flanders (2/3/10)
Articles
One-way bet? BBC News blogs: Stephanomics, Stephanie Flanders (1/3/10)
Euro drops to lowest level in 10 months against dollar BBC News (2/3/10)
Fiscal and political fears hit sterling Financial Times, Peter Garnham (1/3/10)
Sterling’s slide is not just about polls Financial Times (2/3/10)
Sterling rout is more than a wobble over political uncertainty Guardian, Larry Elliott (1/3/10)
The pound is weighed down Guardian, Howard Davies (2/3/10)
Sterling jitters The Economist (1/3/10)
Sterling crisis might break Britain’s political and economic paralysis Telegraph, Jeremy Warner (3/3/10)
Questions
- What are the reasons for the depreciation of sterling between January and March 2010?
- Why was selling sterling a ‘one-way bet’ for speculators?
- Why might there have been ‘overshooting’ of the sterling exchange rate?
- Who gain and who lose from a depreciation of sterling?
- What is the likely effect of a depreciation of sterling on (a) inflation; (b) economic growth; (c) interest rates? Explain your answers.
- How do problems of government debt affect countries’ exchange rates?
The pound has been rising against the US dollar recently. And as the dollar has fallen, so the prices of various commodities, such as gold and silver, have been rising. So what are the reasons for these currency and commodity price movements? The simple answer is that they merely reflect changes in demand and supply. But why have demand and supply been changing? Are there changes in the underlying economic fundamentals, or do they largely reflect speculation in times of uncertainty and resulting market overcorrection? The following articles address these questions.
Sterling rises on hopes of recovery Financial Times (4/6/09)
Jeremy Warner: Dollar weakness is a sign that things are on the mend Independent (4/6/09)
Stephanie Flanders Blog: What goes down… BBC News (3/6/09)
Dollar on the rack International Business Times (1/6/09)
Sterling hits six-month high against the dollar Times Online (29/5/09)
Exchange rates: What next for the pound? This is Money (2/6/09)
Gold News BullionVault (3/6/09)
The Top 10 Reasons to Hold Gold, Bar None! The Motley Fool (2/6/09)
Questions
- Explain why the pound been rising strongly against the dollar.
- What is likely to happen to the exchange rate of the pound against the dollar and the euro over the next few months?
- If it were possible to predict the future exchange rate today, what would happen to the exchange rate today?
- Why might it be a good time to buy gold? Why might it be too late?
The following articles look at a recently published book by George Akerlof of the University of California, Berkeley, and Robert Shiller of Yale. They examine the role of what Keynes called ‘animal spirits’ and is the title of the book.
The motivation to make economic decisions (to buy, to sell, to invest, etc) may not be ‘rational’ in the sense of carefully weighing up marginal costs and marginal benefits. Rather it can be one of over-optimism in good times or over-pessimism in bad times. Just as individuals have ‘mood swings’, so there can be collective mood swings too. After all, confidence, or lack of it, is contagious. This motivation that drives people to action is what is meant by animal spirits.
But are animal spirits a blessing to be nurtured or a curse to be reined in? Should governments seek to constrain them?
An economic bestiary The Economist (26/3/09)
Good Government and Animal Spirits Wall Street Journal (23/4/09)
Irrational Exuberance New York Times (17/4/09)
Animal Spirits: A Q&A With George Akerlof Freakonomics: New York Times blog (30/4/09)
Questions
- Describe what is meant by ‘animal spirits’ and their effects on human behaviour.
- Why may animal spirits make economies less stable?
- How may animal spirits help to explain exchange rate overshooting?
- Discuss whether governments should seek to constrain animal spirits and make people more ‘rational’? Also consider what methods governments could/should use to do this?
Each day many investors anxiously watch the stock market to see if their shares have gone up or down. They may also speculate: buying if they think share prices are likely to go up; selling if they think their shares will fall. But what drives these expectations?
In recent years there is a new factor to account for growing stock market volatility. The Keynesian beauty contest is increasingly being played by computers. They are programmed to buy and sell when certain conditions are met. The hundreds of human traders of the past who packed trading floors of stock markets, have been largely replaced by just a few programmers, trained to adjust the algorithms of the computers their finance companies use as trading conditions change.