[VFN] VGSF Research Seminar on Friday, Dec. 1st, by Peter Bossaerts
michael.halling at univie.ac.at
Wed Nov 29 01:19:55 CET 2006
Peter Bossaerts from CalTech (California Institute of Technology) is giving
a VGSF research seminar on "EQUILIBRATION UNDER COMPETITION IN SMALLS:
THEORY AND EXPERIMENTAL EVIDENCE" on FRIDAY, Dec. 1st, from 15:30 to 17:00
at the WU Wien (Seminarraum D204, UZA 4, Nordbergstrasse 15, 1090 Wien, see
http://www.wu-wien.ac.at/portal/ueber_wu/standorte/lageplan4 for a detailed
plan). Please find the paper's abstract below.
Peter is going to be in Vienna on Monday and Tuesday (Dec. 4th and 5th).
Please contact Michael Halling if you would like to talk to Peter.
Many real-world markets are competitive only in smalls, taken to mean that
price taking applies only to small orders. Starting from this observation, a
theory of equilibration is derived where orders are optimal merely in a
local sense. Prices are assumed to adjust in the direction of the order
imbalance. In the context of financial markets populated with mean-variance
optimizing agents, the theory predicts that a security's price will
correlate with excess demands in other securities, and the sign of this
correlation is the same as that of the covariance of the final payoffs. In
the short run, prices tend to a local equilibrium where the risk-aversion
weighted endowment portfolio (RAWE) is mean-variance optimal. Relative to
the market portfolio, RAWE overweighs securities that are held
disproportionally by more risk averse agents; RAWE puts less weight on
securities that are held primarily by more risk tolerant agents. Throughout
equilibration, portfolio separation is violated generically, and violations
are more extreme when payoff covariances are positive. For a variety of
patterns of initial allocations (including identical initial holdings), the
equity premium is larger at the outset than at (CAPM) equilibrium. All these
implications are confirmed in experiments.
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