RGE monitor Aug 15, 2007
Economists distinguish between “Risk” and “Uncertainty”: the former can be priced by financial markets while the latter cannot. The distinction between the two was made by the famous economist Frank H. Knight in his seminal book, Risk, Uncertainty, and Profit (1921). In brief, “Risk is present when future events occur with measurable probability” while “Uncertainty is present when the likelihood of future events is indefinite or incalculable”.
This distinction between risk and uncertainty helps to explain the recent market panic and turmoil. Today, the FT cites a market economist at Lehman who said: “We are in a minefield. No one knows where the mines are planted and we are just trying to stumble through it”. A few days ago another market participant put it this way: “It is not the corpses at the surface that are scary; it is the unknown corpses below the surface that may pop up unexpectedly”.
Unknown minefield; unexpected corpses: this is “uncertainty” rather than “risk”. Risk can be measured and priced because it depends on know distributions of events to which investors can assign probabilities. Uncertainty cannot be priced by markets because it relates to “fat tail” distributions and extreme events that cannot be easily predicted or measured. A few days ago the CFO of Goldman Sachs justified the massive – 30% plus - losses of the two Goldman Sachs hedge funds by arguing that these were unpredictable “25 standard deviation events” that should occur only once in a million years. The same thing was said by the LTCM “masters of the universe” when their highly leveraged hedge fund went belly up in 1998.
Too bad that these fat tail events do occur more often than once in a million years: the real estate bubble and bust and S&L crisis of the late 1980s; the boom and bust of the tech stocks in 2000-2001; the 1987 stock market crash; the 1998 LTCM debacle; the variety of asset bubbles that ended up into busts from Japan (1980s) to East Asia (1997-98).
Indeed, for many reasons the current market panic has to do with unpriceable uncertainty rather than measurable risk.
First, we have no idea of what the subprime and other mortgage losses will be: $50 billion, $100 billion, $200 billion? They could be as large as $500 billion if the US enters in a recession and we have a systemic banking and financial crisis. The uncertainty about these losses depends on the fact that we have no idea of how deep and protracted the housing recession will be and how much will home prices will fall. If home prices were to fall – as my research suggests as likely – more than 10% in the next year or so, the subprime carnage will massively expand to near prime mortgages and prime mortgages. There is already plenty of evidence that the delinquencies are not limited to subprime mortgages as a number of near prime and prime lenders are now bankrupt or in trouble (AHM, Countrywide just to cite two examples). The worse the housing recession will be the worse these now uncertain losses.
Second, we have no idea of where the mines and the corpses are. Every day the turmoil is popping out in unexpected institutions and places: by now hedge funds, banks and asset managers in US, France, Germany, UK, Asia, Australia have gone belly up. And every day a different financial market gets into a liquidity crunch and credit crunch: first subprime; then near prime, prime, CDOs, CLOs, LBOs, ABCPs, corporate credit spreads, overnite interbank loans, money market funds, mutual funds. Every day we get a different surprise that adds to the market’s uncertainty and investors’ nervousness.
This increased financial uncertainty is in part due to the increased opacity and lack of transparency in financial markets.
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