**John K.-H. Quah**

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**Publications**

**Discounting, Values, and
Decisions (with Bruno Strulovici).** Forthcoming article,
**Journal of
Political Economy**. Studies how optimal stopping and control vary with the
discount rate.

**Revealed
preference tests of the ****Cournot****
model**** (with Andres
****Carvajal****, Rahul
Deb, and James ****Fenske**).
Forthcoming article in **Econometrica**. There
is also a
working paper
with other results. Develops a revealed preference test (in the form of a linear program) for the
hypothesis that the firms are playing a Cournot
game, assuming convex cost functions and observations generated by demand varyiation.

**Emissions
trading with profit-neutral permit allocations**** (with
Cameron Hepburn and Robert Ritz), Journal of Public Economics, Vol. 98, 85--99
(2013).** Examines the impact of an emissions trading scheme (ETS) on
equilibrium emissions, output, price, market concentration, and profits in a
generalized Cournot model. Develops
formula for the number of emissions permits that have to be freely allocated to
firms to neutralize the profit impact of the ETS and relates it to Herfindahl index.

**Revealed
Preference in a Discrete Consumption Space****
****(with Matthew ****
Polisson****), American Economic Journal: Microeconomics,
Vol. 5(1), 28-34 (2013).**
Shows that an agent maximizing some utility function on a discrete (as opposed
to continuous) consumption space will still obey the generalized axiom of revealed
preference (GARP).

**Aggregating the single crossing property****
****(with Bruno ****
Strulovici****).****
****Econometrica****,
Vol. 80 (5), 2333-2348 (2012)**.
Introduces
a new condition characterizing when the single crossing property is preserved
under aggregation. Applications to optimal decisions under uncertainty, the existence of
monotone equilibria in Bayesian-games, etc.. Seminar
slides
for this paper are available.

**Comparative Statics, ****
Informativeness****, and the Interval Dominance Order****
(with Bruno ****Strulovici****),
****Econometrica****, Vol.
77 (6), 1949-1992 (2009)**.
Identifies a new way to order functions, called the *interval
dominance order, that*
generalizes both the single crossing property and a standard condition used in
statistical decision theory. Provides a unified treatment of
the major theorems on monotone comparative statics,
the comparison of signal informativeness, and a
non-Bayesian theorem on the completeness of increasing decision rules.
Application to optimal stopping time problems where the single crossing property
is typically violated. Seminar
slides and
also slides on background
material are available. Additional related material is found in
Comparative Statics with the
Interval Dominance Order: Some Extensions (incomplete notes dated 9
December 2007; fuller version to be posted at a later date).

**The existence of equilibrium when excess demand obeys the weak axiom****,
Journal of Mathematical Economics, Vol. 44(3-4), 337-343 (2008)**.
Elementary proof
of equilibrium existence when the excess demand correspondence obeys the weak
axiom of revealed preference.

**The comparative statics of constrained
optimization problems****,
**
**Econometrica****,
Vol. 75, No. 2, 401-431 (2007)**. Extends the methods of
monotone comparative statics to deal with commonly-encountered comparative
statics problems involving changes to constraint sets. See also
Additional notes on the comparative statics of constrained
optimization problems,
Working Paper, Nuffield College, Oxford, No. 2006-W09.

**A contribution to duality theory, applied to
the measurement of risk aversion,****
**
**(with
Juan Enrique Martinez-****Legaz**)**
****Economic Theory, Vol. 30,
No. 2, 337-362 (2007)**.
Examines the connection between the
curvature properties of an objective function and the ray-curvature properties
of its dual. Characterizes the relationship between an
agent’s attitude towards income risks and her attitude towards risks in the
underlying consumption space.

**Weak Axiomatic Demand Theory****, Economic Theory, Vol.
29, No. 3, 677-699 (2006)**.
Identifies a class of complete but not necessarily transitive preferences which
generate demand functions that obey the weak axiom of revealed preference and
within which any function obeying the weak axiom can be rationalized.

**
Homothetic or Cobb-Douglas **
**behavior****
through aggregation****, Contributions to Theoretical
Economics, Vol. 3, No. 1, Article 8 (2003)(with Gael Giraud)**.
Shows
how consumers' (heterogeneous) preferences in a market could be distributed in
such a way that aggregate market demand takes on exact homothetic or
Cobb-Douglas properties.

Market demand and comparative statics when goods are normal, Journal of Mathematical Economics, Vol.39, 317-333 (2003). Explores the consequences of normal demand on comparative statics in exchange, production, and financial economies.

**The law of demand and risk aversion****, Econometrica,
Vol. 71, 713-721 (2003).**
Shows that the law of demand can be *characterized*
by a modified version of the
Milleron-Mitjuschin-Polterovich condition. The condition could be
interpreted as a measure of differences in risk aversion when an agent
encounters different lotteries over commodity bundles in commodity space.

**The
monotonicity of individual and market demand****, Econometrica
Vol. 68, No.4 (July 2000), 911-930.** Shows that the law of demand
for market demand (market monotonicity) can arise through a range of
conditions between two extremes known to guarantee market monotonicity: the
Milleron-Mitjuschin-Polterovich conditions on
individual preferences and the Hildenbrand
conditions on the income distribution.

**
The
law of demand when income is price dependent, **
**Econometrica****, Vol. 65,
(November, 1997) 1421-1442. U**ses a weaker form of the demand heterogeneity assumption employed by
Grandmont (1992)
to guarantee the uniqueness and stability of the equilibrium price
in exchange and production economies.

Survey

**Law of Demand****
(with Michael ****Jerison**).
**The New Palgrave Dictionary of Economics, Second Edition (2008)**.
There is also a working
paper of this entry.