There is nothing so disastrous as a rational investment policy in an irrational world.
Interpretation
The quote emphasizes that logical investment strategies can fail in an unpredictable and irrational market environment.
John Maynard Keynes points out the paradox of trying to apply rational investment strategies in a world that often behaves unpredictably and irrationally. This highlights the challenges investors face when market conditions are influenced by emotions, speculation, and other non-logical factors, suggesting that even the best-planned investment policies can lead to disaster if they don't account for the inherent chaos of the market.
In practice
During a finance seminar discussing market trends and rational investing strategies.
As time goes on, I get more and more convinced that the right method of investment is to put fairly large sums into enterprises which one thinks one knows something about and in the management of which one thoroughly believes.
The ideas of economists and political philosophers, both when they are right and when they are wrong, are more powerful than is generally understood. Indeed, the world is ruled by little else.
The disruptive powers of excessive national fecundity may have played a greater part in bursting the bonds of convention than either the power of ideas or the errors of autocracy.
We will not have any more crashes in our time.
This long run is a misleading guide to current affairs. In the long run we are all dead. Economists set themselves too easy, too useless a task if in tempestuous seasons they can only tell us that when the storm is long past the ocean is flat again.
The book, as it stands, seems to me to be one of the most frightful muddles I have ever read, with scarcely a sound proposition in it beginning with page 45 [Hayek provided historical background up to page 45; after that came his theoretical model], and yet it remains a book of some interest, which is likely to leave its mark on the mind of the reader. It is an extraordinary example of how, starting with a mistake, a remorseless logician can end up in bedlam.
If you make time each month to give your money some attention, you'll start the next year in fabulous financial shape.
Have rational expectations for future returns and avoid changing those expectations in response to the ephemeral noise coming from Wall Street.
I believe, in the stock market - that's one of my fields - that most people are irrational. And to be irrational, you can be irrational in so many different ways that, practically, the result is indeterminate.
Investing is forgoing consumption now in order to have the ability to consume more at a later date.
The research indicates that when we women invest, we women do tend to be more patient, take a longer-term perspective and as a result of it, tend to be better investors than men. But the messages we get are that investing is sort of 'the guys' world.'
When getting help with money, whether it is insurance, real estate or investments you should always look for a person with the heart of a teacher, not the heart of a salesman.
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