Learning, Adaptive Expectations, and Technology Shocks
Working Paper No. 08-W07
Kevin X.D. Huang, Zheng Liu, and Tao Zha
ABSTRACT [article]
This study explores theoretical and macroeconomic implications of
the self-confirming equilibrium in a standard growth model. When
rational expectations are replaced by adaptive expectations, we
prove that the self-confirming equilibrium is the same as the steady
state rational expectations equilibrium, but that dynamics around
the steady state are substantially different between the two
equilibria. We show that, in contrast to \citet{nWilliams03}, the
differences are driven mainly by the lack of the wealth effect and
the strengthening of the intertemporal substitution effect, not by
escapes. As a result, adaptive expectations substantially alter the
amplification and propagation mechanisms and allow technology shocks
to exert much more impact on macroeconomic variables than do
rational expectations
Keywords and Phrases: Self confirming equilibrium, amplification, labor market
dynamics, wealth and substitution effects, hump-shaped responses
JEL Classification Numbers: E32, E37