Tag: high-frequency trading

Thirty years ago, on Monday 19 October 1987, stock markets around the world tumbled. The day has been dubbed ‘Black Monday’. Wall Street fell by 22% – its biggest ever one-day fall. The FTSE 100 fell by 10.8% and by a further 12.2% the next day.

The crash caught most people totally by surprise and has never been fully explained. The most likely cause was an excessive rise in the previous three years, when share prices more than doubled. This was combined with the lack of ‘circuit breakers’, which today would prevent excessive selling, and a ‘herd’ effect as people rushed to get out of shares before they fell any further, creating a massive wave of destabilising speculation.

Within a few weeks, share prices started rising again and within three years shares were once again trading at levels before Black Monday.

Looking back to the events of 30 years ago, the question many fund managers and others are asking is whether global stock markets are in for another dramatic downward correction. But there is no consensus of opinion about the answer.

Those predicting a downward correction – possibly dramatic – point to the fact that stock markets, apart from a dip in mid-2016, have experienced several years of growth, with yields now similar to those in 1987. Price/earnings ratios, at around 18, are high relative to historical averages.

What is more, the huge increases in money supply from quantitative easing, which helped to inflate share prices, are coming to an end. The USA ceased its programme three years ago and the ECB is considering winding down its programme.

Also, once a downward correction starts, destabilising speculation is likely to kick in, with people selling shares before they go any lower. This could be significantly aggravated by the rise of electronic markets with computerised high-frequency trading.

However, people predicting that there will be little or no downward correction, and even a continuing bull market, point to differences between now and 1987. First, the alternatives to shares look much less attractive than then. Bond yields and interest rates in banks (at close to zero), unlike in 1987, are much lower than the dividend yields on shares (at around 4%). Second, there are circuit breakers in stock markets that suspend dealing in cases of large falls.

But even if there is a downward correction, it will probably be relatively short-lived, with the upward trend in share prices continuing over the long term. If you look at the chart above, you can see this trend, but you can also see periods of falling share prices in the late 1990s/early 2000s and in the financial crisis of 2008–9. Looking back to 1987, it seems like a mere blip from the perspective of 30 years – but it certainly didn’t at the time.

Articles

Three decades since Black Monday – are markets on the verge of another tumble? The Telegraph, Lucy Burton (19/10/17)
Black Monday: 30 years on from the 1987 crash Citywire, Michelle McGagh (19/10/17)
30 Years Ago: Lessons From the 1987 Market Crash U.S.News, Debbie Carlson (12/10/17)
Black Monday: Can a 1987-style stock market crash happen again? USA Today, Adam Shell (19/10/17)
Black Monday anniversary: How the 2017 stock market compares with 1987 MarketWatch, William Watts (19/10/17)
30 years after Black Monday, could stock market crash again? MarketWatch, William Watts (19/10/17)
The Crash of ’87, From the Wall Street Players Who Lived It Bloomberg, Richard Dewey (19/10/17)

Questions