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Shares: Market Cap. / GDP
Shares are undervalued
when the orange line is above the yellow and dear when the opposite applies
This investment tool is
especially relevant for identifying major stock market bubbles or depressions, by looking
beyond the current level of company profitability. The market capitalisation / GDP ratio
is intended to perform for whole markets a similar role to that performed by Price / Sales
ratios for the analysis of individual companies. It may also be helpful in identifying
cyclical swings in valuation. For comparability, stock market indexes have been rebased to
set year-end 1994 at 100.
In each chart the stock
market index is shown as the
thick white line on the right
hand axis. The main explanatory variable, the ratio of market cap/GDP, is shown as the thin yellow line using the left hand axis, while the series
representing the level at which this ratio represents Fair Value is shown as the thin orange line on the same axis.
This tool overcomes the
problem of PE ratios in validating cyclical extremes in profitability. When profit margins
(E/S) are cyclically depressed, price earnings multiples (P/E) should be abnormally high
and vice versa. This ratio eliminates profits (E) from both equations as follows: P/E x
E/S = P/S, where P is Price, E is Earnings and S is Sales. The whole market calculation is
derived by substituting Market Capitalisation for Price and GDP for Sales.
The market capitalisation
data has been adjusted to eliminate distortions created by capital issues among quoted
companies. This is necessary to take account of changes caused by transfers of productive
capacity from or to the unquoted sector and state-owned sectors, without corresponding
changes in GDP. Such changes include new issues or stock repurchase schemes and is
especially significant in an era of widespread privatisation.
A Fair Value series has been
fitted to the ratio to indicate that changes in inflation justify fluctuations in the
ratio of market cap/GPD. In as far as a fall in inflation generates a corresponding fall
in long-term bond yields, it also justifies higher price earnings ratios, and thus a
higher ratio of market cap/GDP. Mathematically this is 1/(CPI + k) = P/E where CPI is the
Consumer Price Index (smoothed), k is the equity risk premium (historic global average)
and P/E is the PE ratio. The resulting series has been adjusted to give the best fit to
the Market Cap / GDP series of each country. Thus periods of over-valuation can be
identified when the ratio of Market Cap/GDP is above the Fair Value level and conversely
for periods of under-valuation. To examine the underlying elements of this ratio in
greater depth, study the Valuation tools for both bonds and shares.
Please note that comparisons
between countries are not meaningful for several reasons. The extent to which companies
are publicly quoted. The amount of overseas assets owned by publicly quoted companies.
Differences in the weighting of highly rated sectors
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