Bull markets are a wonderful thing for your portfolio. Less so for your ego. Yet the interplay between the two is not always to your portfolio’s benefit.
John Kenneth Galbraith recognized this flaw in human nature when it came to investing from studying the bull market that ended in the 1929 crash.
The anatomy of the self-destroying speculative boom is rather simple. Over a period of time with advancing technology, an increasing national product, and a reliable tendency in the economy to inflation, most common stocks will rise in value. As this happens people are attracted to the market and this causes the stocks to rise more. This further gain attracts yet more people and gradually, perhaps over some years, the purchases of people looking for this increase in value come to determine what stocks are worth. Prospective earnings are still mentioned but as an afterthought — or to show that there is still some tie to reality…
Then, at some stage, the supply of buyers runs out — or dries up. Or there may be public action to dry up the spring. The increase falters. This causes the more knowledgeable or the more nervous to get out. This causes the market to falter more. More decide to get out and the slow upward climb is replaced by a precipitate drop. As I suggested earlier, there usually will be some earlier episodes of nervousness before the climatic fright arrives. The greater the preceding buildup, the more stocks have come to depend on a continuing influx of buyers attracted by the prospect of the capital gains, the more violent will be the eventual collapse.
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