Market Corrections: How Bad Can They Get?

Originally published by BetaShares

The drop back in US equity prices over the past few weeks has had reverberations around the world. At this early stage, it still seems likely this period will prove only a “correction” in the ongoing global equity bull market. In this post I analyse historical market corrections with the data suggesting that the worst of the sharemarket declines are likely behind us, but that a final bottom in the market could still be some weeks, or even months, away.

Sharemarket declines are often labelled differently depending on the degree of share price losses sustained. Let’s talk about the semantics first:

Although opinions can vary, the worst – but best known – sharemarket downturn is called a “bear market” which tends to be defined as a peak-to-trough decline in prices of 20% or more.

By contrast, sharemarket declines of more than 10% (but less than 20%) are typically called “corrections“. Smaller market declines (less than 10%) go by many names, but I like to call them “pullbacks“.

As seen in the table below, market pullbacks are the most common form of market decline – analysing the US S&P 500 Index, there have been 466 pullbacks since the market recovery from the Great Depression(1), with an average decline of 1.5% taking place on average over one and a half weeks. Recovery on average takes a further week. Note the vast bulk of these pull backs (93%) involve declines of less than 5%. In short, market declines of 5% or less are very common and hard to get too worried about.

By contrast, there have been nine bear markets, with an average market decline in these periods of 35.8%, over an average of 65 weeks(2). On average it takes almost twice as long – 116 weeks – for the market to recover its previous (price) peak. As the saying goes, the market goes down the elevator but up the stairs.

What about corrections? The table indicates there have been 11 “corrections” which, perhaps surprisingly, is only slightly more than actual bear markets. Even if we include 10 to 20% market declines during a market recovery (i.e. before prices have reached their previous peak) the number of corrections grows to 13 – which still implies an average of only 1.4 corrections for every bear market.

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Of the 11 strictly defined corrections, the average market loss has been 13.2%, which takes place on average over 20 weeks – or almost six months! Note, moreover, that unlike during bear markets, the average time of market recovery following a correction is considerably quicker than the downturn – only 11 weeks.

Breaking this down further, it’s apparent that 9 of these 11 corrections (82%) were less than 15%. All 11 corrections, along with their depth, length and date of market trough are detailed in the chart below. Also included is the latest correction.

All up, this analysis suggests that if we are truly in only a market correction then chances are that we’ve almost reached bottom. That said, it could take a few more weeks (even months) before the actual bottom is in place.

h2 Has market behaviour changed over time?/h2

To gain an insight into long-run trends over time, the chart below details the peak-to-trough declines in closing daily prices of the US S&P 500 Index over this period.

Just eyeballing the chart, it’s evident that overall market volatility does not appear to have appreciably lessened. If anything, since the early 1990s there have been two relatively extended periods of low volatility but also two relatively deep and more extended bear market periods. This is consistent with the “Great Moderation” in macro-economic volatility in recent decades, but also the potentially greater threat now posed by financial market imbalances in creating bear markets.

Indeed, the two greatest bear markets since the Great Depression also happen to be the two most recent – the early 2000s dotcom crash and the 2007-09 financial crisis.

What’s the implication of all this? To the extent the recent extended period of low volatility does manage to reassert itself for a time, history suggests this may build up pressure such that the next inevitable bear market could also prove relatively deep and protracted.

(1) The Great Depression period was excluded because it was such an outlier in terms of the depth and length of the market downturn. It was instead decided to focus on the more recent post-war period – which still covers more than 50 years!

(2) A week is defined as 5 trading days.

Written By: David Bassanese