Is the stock
market over-valued? Are recent ups and downs the warnings of a weak future stock
market? Can you overcook frog legs? Stockholders want to know answers to these questions.
Trying to forecast the future direction of the stock market is more impossible now than ever. So I am giving up on that and will
try to explain why below. It is perfectly okay to punt on such
things. Sure, there are snake oil salesmen who will forecast quite
assuredly on any day at any time. But as they say – you gotta know when to say
when. This stock market is wandering like an office worker on Tuesday night in Gangnam after one too many Soju.
I am going
to use the S&P 500 index for my discussion below. I could have used any other
major stock index and come to the same conclusions. Essentially these indices track stock prices of the largest American firms. They are measures of “da
market”. The S&P 500 tracks the 500
largest US companies.
Today’s blog
is more about the data and less about the theory. I usually like starting with theory because
it makes sense. For example, a stock is supposed to measure the value of the
company. If investors believe that a company is doing much better these days and
it has higher profits to prove it, then more people want to buy that stock.
They
buy it because they anticipate the company might issue dividends to the stockholders
or they think the price will rise higher in the future. As they buy more of
that stock the price often rises until the point at which people feel the price
is high enough relative to its rewards. If we are
looking at the S&P 500, it often rises when the whole business sector is doing better –
meaning more dividends and higher expected stock prices across the largest and most
representative companies in America.
Stock prices may rise for many reasons. You might be unhappy when your local
bank lowers the interest rate on your saving account to .00003%. So you take
money out of that account and buy a share of the Jack Daniels Company. Any local or global event that induces investors to redirect assets away from other
investments and into US stocks can cause the S&P 500 to rise.
That’s the
end of my maco-finance lecture. The reason for reviewing some of this theoretical minutia
is that there is plenty of difference of opinion about the future course of the
stock market based on theory. There is ALWAYS plenty of difference of opinion among theorists about the market. There might be more now than usual but
it seems to me the overpowering case for stock price uncertainty is not the
theory. I think it is in the numbers.
Let’s
suppose you have a friend and his name is Mabby. Let’s suppose Mabby weighed
150 pounds for the last 17 years. Knowing nothing about Mabby you might be
quite confident that next December Mabby would weigh about 150 pounds. Now supposed you had another friend named Abbmar.
Abbmar weighed 150 pounds a year ago. Last December he weighed 350 pounds. In March
he weighed 200. What is your best guess as to Abmar’s weight in three months? I
am guessing you would have a lot of uncertainty about that prediction and you
wouldn’t bet a lot on its accuracy.
That’s the
way I feel about the S&P 500 right now. Most graphs of the S&P compare its
value today to what is was recently.
Most geniuses compare it to a low point in 2009. Since then it has oscillated
quite a but but the main story is its upward trend. But that little bit of
history is very misleading since it looks at today relative to a recent low
value.
So I decided
to look at the S&P 500 going back to when it was just a little pup in 1950.
I deflated all the monthly values for general inflation because you cannot
compare apples and oranges or something like that. Then I graphed it. I could have calculated a bunch of really cool statistical numbers but sometimes just looking at the
graph is enough. See the Chart below. (Note: The
S&P 500 value today is approximately 2100. But when you deflate it by a CPI
value of about 234, you get a number more like 8.)
·
From
1950 to about 1968 the real S&P 500 rose from a value of about 0.75 to about 3.
The line looks pretty smooth despite there being plenty of ups and downs over
those 19 years.
·
From
the end of 1968 to the middle of 1982 the market was generally declining from
about 3.0 to a low value of about 1.0. So we had about 15 years of a downward
trend.
·
Then
we had another time period of S&P expansion with few major downturns
from 1.0 in 1982 to a value of almost 3.3 in early 1994. It took about 13 years
but we got back to an old peak value of around 3.
·
In
short we had three long cycles from 1950 to 1994 and the market value rose from
about 1 to 3 in those 45 years.
·
Then
it gets really weird. The S&P started drinking too much JD. The real S&P 500
almost tripled from about 3 in 1994 to almost 9 in early 2000. The market dove from that peak of near-9 in early 2000 to just above 4.5 in early 2003. It
reversed and went to above 7 at the end of 2007 and then to about 3.5 at the
end of 2009. It is closing now again on 9. Are you seasick yet?
What can we
say? First, we used to have long term trends in market direction that lasted
for a decade or two. Now we have significant directional changes that last for
at most a handful of years. Second, with those rapid direction changes go large percentage
changes. A statistician might say that the standard deviation or variance has
increased. Others might say the data is much more volatile lately. No matter
how you say it – the market seems very unpredictable right now.
Finally,
even with all this craziness – it is not
easy to know what the most relevant previous peak is. The market hit 9
twice so maybe that is the new peak. But those peaks came after some unique
situations and may have involved bubbles. One recent peak was squeezed between
the 9s – of about 7.5. Today we are well above that one. There is also the
previous high level of about 3. If that is the relevant peak then the market
has a lot of room to fall in the future.
Being at or
near the highest of the past peaks makes it hard for one to forecast anything
good for the future value of the real S&P 500. So I did one more thing. I drew a
line of constant 5% real growth from the peak value of 3.0 in 1994. ( See the red line on the chart below.) Today that
5% constant growth line produces a trend value of about 9.2 for the real
S&P 500. Thus if we just erased a lot of crazy ups and down of the last 22
years and replaced all that with steady real growth of 5%, we would be at a value
similar to what we experienced last week in the real S&P 500. In one year, it predicts
a S&P 500 value of near 9.7.
