The Accuracy of Fundamental Stock Market Price Estimates and a Refinement to the Donaldson-Kamstra Fundamental Estimate

Mark Kamstra () and R. Glen Donaldson ()
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R. Glen Donaldson: University of British Columbia

No 954, Computing in Economics and Finance 1999 from Society for Computational Economics

Abstract: A core tenet of financial economics states that, in a market populated by rational investors, the fundamental price of an asset equals the expected discounted present value of its cash flows. This implies, for example, that in a rational and efficient bubble-free market, stock-price movements are driven by forecasted changes in dividends and interest rates and not by the "irrational exuberance" of traders. Interest in the extent to which market prices are fundamentally driven has been particularly high of late, with everyone from academics to the Chairman of the U.S. Federal Reserve Board, Alan Greenspan, offering opinions. Research into fundamental valuation is therefore particularly timely. Several different procedures have been developed to estimate fundamental prices and to test whether market prices deviate in a significant way from the estimated fundamental price. Many studies have reported what appear to be important deviations from fundamentals, especially around market crashes such as those that occurred in 1929 and 1987. Unfortunately, the accuracy of various fundamental price estimating procedures has not been measured by anyone in the literature, to the best of our knowledge. The issues of the magnitude of the bias, of the reliability of fundamental prices, and effects these have on excess volatility tests are not analytically tractable. However, they can be evaluated through Monte Carlo simulation. The Monte Carlo is accomplished by generating "economies" calibrated to the real world, with a known fundamental price, and investigating the properties of the fundamental prices -- the bias and the average deviation. A refinement of the Donaldson-Kamstra technique for estimating fundamentals (RFS 1996) is also developed and explored.

Date: 1999-03-01
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