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  • The Quest for Certainty

    The last two weeks we have been looking at the problems with models. First we touched on what I called the Economic Singularity. In physics a singularity is where the mathematical models no longer work. For example, models based on the physics of relativity no longer work if one gets too close to a black hole. If we think of too much debt as a black hole of sorts, we may understand why economic models no longer work. Last week, in “The Perils of Fiscal Cliff,” we looked at the use of fiscal multipliers by economists in order to argue for or against governmental economic policies. Do you argue for austerity, or against it? There is a model that will support your case, most likely using the same data that your adversary uses.

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  • How Shall We Then Invest?

    Warren Buffett says buy. Jeremy Grantham says it will get worse. Both are celebrated value investors. Who is right? It all depends upon your view of the third derivative of investing. Today we look at valuations in the stock market. This is the second part of a speech I have given in the past few weeks in California and Stockholm. I am updating the numbers, as the target keeps moving. While from one perspective things look rather difficult, from another there is a ray of hope. What can you expect to earn from stocks over the next five years? It should make for an interesting letter. Note: this will be a little longer than usual, but part of it is there are a LOT of charts. I should note that I am rewriting this on Monday. For the first time in over 8 years, I missed my Friday night deadline (see below). Last week's title for the letter was "The Economic Blue Screen of Death." By that I referred to the old "blue screen of death" that we used to get on early versions of Microsoft MS-DOS and Windows. You could be working away and suddenly, for no apparent reason, the computer would freeze up and you would get a blue screen. The only thing you could do was unplug the computer and hit the reset button - losing everything that was not saved when the computer crashed....