A Shot Across The Bow For “Passive Indexers”

 | Jun 13, 2017 07:18AM ET

I wanted to pick up on a discussion I started in this past weekend’s missive, with respect to both Friday’s rout in technology stocks as well as Monday’s rather nasty open. While the issue seemed to be a simple short-term rotation in the markets from large capitalization Technology and Discretionary stocks into the lagging small and mid-capitalization stocks, the sharpness of the “Tech Break” on Friday revealed an issue worth re-addressing. To wit:

Both Discretionary and Technology plunged on Friday as a headline from Goldman Sachs (NYSE:GS) questioning ‘tech valuations’ sent algo’s running wild. The plunge was extremely sharp but fortunately regained composure and shares rebounded. A ‘flash crash.’

One day, we will not be so lucky. But the point I want to highlight here is this is an example of the ‘price vacuum’ that can occur when computers lose control. I can not stress this enough.

This is THE REASON why the next major crash will be worse than the last.

I am not alone in this reasoning. Just recently John Dizard wrote for the Financial Times:

The most serious risks arising from ETFs are the macro consequences of too much capital being committed in too few places at the same time. The vehicles for over-concentration change over time, such as the ‘Nifty Fifty’ stocks back in 1973, Mexican and Argentine bonds a few years after that, internet shares in 1999, and commercial property every other decade, but the outcome is the same. Investors’ cash goes to money heaven, and there is a pro-cyclical decline in productive investment.

Risk concentration always seems rational at the beginning, and the initial successes of the trends it creates can be self-reinforcing. Since US growth stocks such as Avon (NYSE:AVP), the cosmetics company, Polaroid, the photography group, and IBM (NYSE:IBM), the computer company, outperformed the market, growth-orientated portfolio managers raised more money in the early 1970s, which then led to more cash going to buy the same stocks.

Andrew Lapthorne from Societe Generale (PA:SOGN) also weighed in:

The sell-offs themselves are not particularly unusual, but the uniformity of the price moves all on the same day indicates a market driven by price chasing momentum, with investors heading for the door all at the same time.

Indeed, those S&P 500 stocks which sold-off on Friday were almost all from the strongest performing decile over the previous 12 months (the r-squared on the S&P 500 line in the chart below is 85%). Within Nasdaq, the relationship is even stronger at 95%.

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