Keynes’s *General Theory*, chapter 12

In practice we have tacitly agreed, as a rule, to fall back on what is, in truth, a convention. The
essence of this convention — though it does not, of course, work out
quite so simply — lies in assuming that the existing state of affairs
will continue indefinitely, except in so far as we have specific
reasons to expect a change. This does not mean that we really believe
that the existing state of affairs will continue indefinitely. We know
from extensive experience that this is most unlikely. The actual
results of an investment over a long term of years very seldom agree
with the initial expectation. Nor can we rationalise our behaviour by
arguing that to a man in a state of ignorance errors in either
direction are equally probable, so that there remains a mean actuarial
expectation based on equi-probabilities. For it can easily be shown
that the assumption of arithmetically equal probabilities based on a
state of ignorance leads to absurdities. We are assuming, in effect,
that the existing market valuation, however arrived at, is uniquely correct in
relation to our existing knowledge of the facts which will influence
the yield of the investment, and that it will only change in proportion
to changes in this knowledge; though, philosophically speaking it
cannot be uniquely correct, since our existing knowledge does not
provide a sufficient basis for a calculated mathematical expectation.
In point of fact, all sorts of considerations enter into the market
valuation which are in no way relevant to the prospective yield.

Nevertheless the above conventional method of calculation will be
compatible with a considerable measure of continuity and stability in
our affairs, so long as we can rely on the maintenance of the convention.

For if there exist organised investment markets and if we can rely
on the maintenance of the convention, an investor can legitimately
encourage himself with the idea that the only risk he runs is that of a
genuine change in the news over the near future, as to the
likelihood of which he can attempt to form his own judgment, and which
is unlikely to be very large. For, assuming that the convention holds
good, it is only these changes which can affect the value of his
investment, and he need not lose his sleep merely because he has not
any notion what his investment will be worth ten years hence. Thus
investment becomes reasonably “safe” for the individual investor over
short periods, and hence over a succession of short periods however
many, if he can fairly rely on there being no breakdown in the
convention and on his therefore having an opportunity to revise his
judgment and change his investment, before there has been time for much
to happen. Investments which are “fixed” for the community are thus
made “liquid” for the individual.

It has been, I am sure, on the basis of some such procedure as this
that our leading investment markets have been developed. But it is not
surprising that a convention, in an absolute view of things so
arbitrary, should have its weak points. It is its precariousness which
creates no small part of our contemporary problem of securing
sufficient investment.

The insights here have yet to be fully mined.

Comments

This chapter could be called the "immaculate deception": how liquid financial assets from risk adverse investors are turned into long term illiquid investments. Seems like Keynes did not buy EMH: If everyone else is selling, then you are well advised to sell as soon as you can. Like a bank panic, the value of a financial asset is subject to self-fulfilling prophecy.

"The insights here have yet to be fully mined."

This means "formalized into a tractable mathematical construction", right?

And of course regardless of the loss of cognitive content ....

Your time would be better spent reading Mises, Hayek, and Friedman. The sad truth is that some human beings embrace freedom, and other who can't embrace the results that they should be responsible for the consequences of their own actions try to destroy freedom. FDR should never have propped up the Federal Reserve System in the Great Depression. It should have failed then, but no, we have to deal with its massive shortcomings again. When will people learn that centralization is the problem. Probably never.

This chapter could be called the "immaculate deception": how liquid financial assets from risk adverse investors are turned into long term illiquid investments. Seems like Keynes did not buy EMH

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