From The Economist
Some began to argue that volatility had moved to a structurally lower level thanks to the activity of hedge funds and to the development of complex products and derivatives. A new, more sophisticated financial system had spread risk more efficiently, it was said.
But over the past 12 months, the standard measure of stockmarket volatility, the Vix (or volatility index), has roughly doubled. On top of that, there have been wild swings in government bond yields, a jump in debt spreads and the continuing decline of the dollar. ...
In quiet markets, the number of people who want to sell options increases, driving their prices, and thus the level of implied volatility, down. That was one reason why volatility was so low last year. But when the markets went into a tailspin in August, volatility suddenly surged; it became much more likely that those who had previously bought options would be able to exercise them (particularly put options, which grant the right to sell at a given price). Option-sellers suddenly faced losses; some, realising the risks, probably withdrew from the business. That forced implied volatility even higher.
There is thus a cyclical element to volatility, as investors move from complacency to alarm. That fits in with the work of Hyman Minsky, an economist who suggested that periods of stability may sow the seeds of future volatility. If economic growth and interest rates are stable, businesses and consumers will be encouraged to take more risks, and in particular to take on more debt. Eventually, small changes in interest rates will have a much greater impact on balance sheets and on consumer willingness to spend.
We are in a period of higher volatility. And higher volatility means lower equity returns.
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