On the fragility of reputational equilibria under systematic uncertainty: what is wrong with rational expectation
Keywords:Reputational equilibria, Informational asymmetry, Individual monitoring, Monetary policy
The present work examines the case in which the imperfect monitoring of policy does not derive from the existence of some informational asymmetry, but rather directly from a limited monitoring ability of economic agents in a framework that is closest in its essence to that of complete information. This shows that imperfections in the individual monitoring abilities destroy the very possibility of a reputational equilibria. Thus, the existing literature on credibility and reputation does not provide a convincing explanation of the existence of reputational effects in the real world policy game. The author argues that the use of rational expectations models in policy analysis is even less motivated than their use as a rigorous theoretical description of the working of the economic system. As a consequence, a major change in the analytical framework is required to achieve a sensible model of reputational forces in the conduct of monetary policy.
JEL: D82, E52
BACKUS;J?AVID and JOHN DRIFFILL, 1985, "Inflation and reputaclon", American Economie
ReVlew, 75, 530-538.
BARRO, ROBERT J., 1989, ''Introduction'', in: R,]. Barro, ed., Modern Business Cycle
Theory, Basi! BIackwell, Oxford, 1-15.
BARRO, ROBERT J. and DAVID B. GoRDON, 1983a,
a natural rate model", Journal 01 Politica! Economy, 91, 589-610.
BARRO, ROBERT J. and DAVID B. GaRDON, 1983b, "Rules, discretion and reputation in a
model of monetary policy", Journal 01 Monetary Eeonomies, 12, 101.121.
BLUME, LAWR~~,CE a?d DAVID EASLEY, 1989, "Wealth dynamics and the market se1eetion
hypothesls , mlmeo, Cornell University,
BUITER, WILL~M H., 1989, "Intr~duetion. After the New Classica! Macroeconomics", in:
W.H. BU1ter, Maeroeconomtc Theory and Stabilization Policy, Manehester University
Press, Manehester, l-53.
CANZONE~, ~TTHE:V B., 1985, "Monetary pol1ey games and the tole of private informatlOn
, Amertcan Economie Review, 75, 1056-1070.
CUKn::~, ALEX and ~LAN J:f. MELTZER, 1986, "A theory of ambiguity, etedibility, and
tnflatlon under dlseretlon and asymmetrie information" Eeonometrica 54
-1128. " ,
GROSSMAN, SANFORD !-' .1981, "~,!ntroduction to the theory of rational expeetations
under asymmett1c lnformatlon , Review 01 Economie Studies, 48, 541.559.
HEINER, RON,ALD A., .1989, "The origin of predietable dynamic behavior", Journal ~I
Economte Behavtor and Organization, 5, 57-76.
LUCAS,' ROBERT E. JR., 1976: "Eeonom,etric poliey evaluation: A critique", Carnegie
Rochester Conference Sertes on Publtc Policy, 1, 19-46.
LUCAS, ROBERT E. !R., 1980, "~ethods and problems in business eycle theory", Journal 01
Money, Credtt and Banktng, 12, 696.715.
Banca Nazionale del Lavoro
MANDELBROT, BENOIT B., 1982, The fractal geometry 01 nature, Freeman, San Fran~
ROGOFF, KENNETH, 1989, "ReputatioD, coordination, and monetary policy", in R.I.
Barro, ed., Modern Business Cycle Theory, Basi! Blackwell, Oxford, 236-264.
SACCO, PIER LUIGI, 1990a, "Notes OD the economics of complexity", mimeo, European
University Institute, Firenze.
SAcco, PIER LUIGI, 1990b, "rhe lady and the trunk, or: What game are we playing?"J
mimeo, European University Institute, Firenze.
SARGENT, THOMAS J., 1986, Rational Expectations and In/lation, Harper and Row, New
SARGENT, THDMAS J. aod NEIL WALLACE, 1984, (lSome unpleasant monetarist arithmetic",
in: B. Griffiths aod G.E. Wood, eds., Monetarism in the U.K., Macmillan, London,
TVERSKY, AMOS and DANIEL KAHNEMAN, 1986, "Rational choice and the framing of
decisions", The Journal 01 Business, 59, S251·S278.