Stock Valuations Using Stock Market Capitalization/GDP
I think all of us have a lot of respect for Warren Buffet, so whenever he gives us a tip on how he invests or gives an insight on how he invests, we listen. One point he made recently was to look at the total stock market capitalization compared to GDP. In recent years, market has done better when it’s in the 80% range than when stocks are valued above GDP. This, of course, rang true the most during the dot com bubble.
I’m not going to delve into checking up on this, since even if I did, I’d probably mess up somehow. But one point I would make is that whatever correlation there, we also need to factor in government’s percentage of GDP.
Since GDP is just calculated as Consumptions + Investment + Government + Net Exports, simply increasing government will increase GDP, but that won’t necessarily increase corporate profits. At the extreme example would be a completely communist country where there would be no corporate profits (no stock market in general) since they would all be seized by the state. Of course, the country still has GDP, since the government spends money. We would expect that countries with a higher percentage of GDP made up by government to have a lower stock market capitalization/GDP compared to more capitalist countries.
In short, all GDP isn’t created equal when it comes to corporate profits. An increase in GDP due to consumption/investment bodes well for stock profits, whereas one driven by government does not.
I assembled some data from the CIA world factbook comparing the total stock market capitalization/GDP. Since the data is at the end of 2007, valuations were obviously much higher then:
USA: 137%
Japan: 92%
France: 68%
UK: 143%
Germany: 55%
There’s a wide variation, but with the exception of the UK, the trend is clear. Out of these, our situation most resembles Japan, in terms of corporate taxes, debt/GDP, and the ultimate amount of government spending will be a part of GDP. Let’s make a rather bold assumption and assume that our market and Japan’s market was about equal in terms of accuracy of valuation at the time. Given that, we would ultimately expect the market’s capitalization/GDP to be about 33% less on average than it was during Reagen/Bush/Clinton years after Obama and Congress are through with their stimulus plans and tax hikes.