Common Stocks and Uncommon Profits and Other Writings



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Common Stocks and Uncommon Profits and Other Writings ( PDFDrive )(1)

2 6 8
 
since the favorable influences that make a potential buyer believe that
an attractive situation exists are already reflected in the price of stock! 
If the market was as efficient as it has become fashionable to believe, 
and if important opportunities to buy or significant reasons to sell were 
not constantly occurring, stock returns should not subsequently have
the huge variations that they do. By variation, I am not referring to 
changes in prices for the market as a whole, but rather the dispersion of 
relative price changes of one stock against another. If the market is effi-
cient in prospect, then the nexus of analysis that leads to this efficiency 
must be collectively poor. 
Efficient market theory grew out of the academic School of Random 
Walkers. These people found that it was difficult to identify technical trad- 
ing strategies that worked well enough after transactions costs to provide 
an attractive profit relative to the risks taken. I don’t disagree with this. As 
you have seen, I believe that it is very, very tough to make money with in 
and out trading based on short-term market forecasts. Perhaps the market 
is efficient in this narrow sense of the word. 
Most of us are or should be investors, not traders. We should be 
seeking investment opportunities with unusual prospects over the long 
run and avoiding investment opportunities with poorer prospects. This 
has always been the central tenet of my approach to investments in any 
case. I do not believe that prices are efficient for the diligent, knowl- 
edgeable, long-term investor. 
Directly applicable to this is an experience I had in 1961. In the fall 
of that year, as in the spring of 1963, I undertook the stimulating duty 
of substituting for the regular finance professor in teaching the senior 
course of investments at Stanford University’s Graduate School of Busi-
ness. The concept of the “efficient” market was not to see the light of
day for many years to come and had nothing to do with my motivation 
in the exercise I am about to describe. Rather, I wanted to show these
students in a way they would never forget that the fluctuations of the
market as a whole were insignificant compared to the differences 
between the changes in price of some stocks in relation to others. 
I divided the class into two groups. The first group took the alpha- 
betical list of stocks on the New York Stock Exchange, starting with the 
letter A; the second group, those starting with the letter T. Every stock 
was included in alphabetical order (except preferreds and utilities, which 
I consider to be a different breed of cats). Each student was assigned four 
stocks. Each student looked up the closing price as of the last day of 



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