Simple efficient markets models imply that the covariance between prices of speculative assets cannot exceed the covariance between their respective fundamentals unless there is positive information pooling. Positive information pooling occurs when there is more information, in a sense defined here, about the aggregate of the fundamentals than there is about the individual fundamentals. With constant discount rates, the covariance between prices (detrended by dividing by a moving average of lagged dividends) in the U. K. and the U. S. exceeds the covariance of the measure of fundamentals, and there is no evidence of positive information pooling. Regression tests of forecast errors in one country on a real price variable in another country show significantly negative coefficients. When the present value formula uses short rates to discount, there is less evidence of excess comovement.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
2846.
Length: Date of creation: Feb 1989 Date of revision: Handle: RePEc:nbr:nberwo:2846
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Nicholas Barberis & Andrei Shleifer & Jeffrey Wurgler, 2002.
"Comovement,"
NBER Working Papers
8895, National Bureau of Economic Research, Inc.
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Barberis, Nicholas & Shleifer, Andrei & Wurgler, Jeffrey, 2005.
"Comovement,"
Journal of Financial Economics,
Elsevier, vol. 75(2), pages 283-317, February.
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