When? That’s what everyone wants to know. The answers to why a bull market ends come pouring in the second the when is confirmed.
But the explanations why are usually complex. They certainly won’t help anyone predict the next turn. They’re often secondary, or scapegoats, to what really happened.
The 1982-87 bull market is a good example. The five year period saw steady gains in most quarters: only 5 out of 20 quarters were negative, with no declines of as much as 10%. And 1987 started off hot, up 21% in the first three months, before peaking in August.
The bull market that culminated in Black Monday ended because…Computers! Computerized trading, that is. That one gets piled on all the time. Portfolio insurance and leverage also got blamed. And they sound good too. Continue Reading…

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