154,659 research outputs found
Conditioning prices on search behaviour
We consider a market in which �firms can partially observe each consumer's search behavior in the market. In our main model, a �firm knows whether a
consumer is visiting it for the �first time or whether she is returning after a previous visit. Firms have an incentive to offer a lower price on a �first visit than a return visit, so that new consumers are offered a "buy-now" discount. The ability to offer
such discounts acts to raise all prices in the market. If �firms cannot commit to
their buy-later price, in many cases �firms make "exploding" offers, and consumers never return to a previously sampled �rm. Likewise, if �firms must charge the same
price to all consumers, regardless of search history, we show that they sometimes
have the incentive to make exploding offers. We also consider other ways in which
�firms could use information about search behaviour to determine their prices
Prominence and consumer search
This paper examines the implications of “prominence” in search markets. We model prominence by supposing that the prominent firm will be sampled first by all consumers.
If there are no systematic quality differences among firms, we find that the prominent firm will charge a lower price than its non-prominent rivals. The impact of making a
firm prominent is that it will typically lead to higher industry profit but lower consumer surplus and welfare. The model is extended by introducing heterogeneous product
qualities, in which case the firm with the highest-quality product has the greatest incentive to become prominent, and making it prominent will boost industry profit, consumer surplus and welfare
Conditions for Nondistortion Interrogation of Quantum System
Under some physical considerations, we present a universal formulation to
study the possibility of localizing a quantum object in a given region without
disturbing its unknown internal state. When the interaction between the object
and probe wave function takes place only once, we prove the necessary and
sufficient condition that the object's presence can be detected in an initial
state preserving way. Meanwhile, a conditioned optimal interrogation
probability is obtained.Comment: 5 pages, Revtex, 1 figures, Presentation improved, corollary 1 added.
To appear in Europhysics Letter
Calculation of Elastic Green's Functions for Lattices with Cavities
In this Brief Report, we present an algorithm for calculating the elastic
Lattice Greens Function of a regular lattice, in which defects are created by
removing lattice points. The method is computationally efficient, since the
required matrix operations are on matrices that scale with the size of the
defect subspace, and not with the size of the full lattice. This method allows
the treatment of force fields with multi-atom interactions.Comment: 3 pages. RevTeX, using epsfig.sty. One figur
The dissipation of the system and the atom in two-photon Jaynes-Cummings model with degenerate atomic levels
The method of perturbative expansion of master equation is employed to study
the dissipative properties of system and of atom in the two-photon
Jaynes-Cummings model (JCM) with degenerate atomic levels. The numerical
results show that the degeneracy of atomic levels prolongs the period of
entanglement between the atom and the field. The asymptotic value of atomic
linear entropy is apparently increased by the degeneration. The amplitude of
local entanglement and disentanglement is suppressed. The better the initial
coherence property of the degenerate atom, the larger the coherence loss.Comment: 11 pages, 4 figure
The Existence of Pure-Strategy Nash Equilibrium in Games with Payoffs that are Not Quasiconcave
Cavity-QED with cold atoms trapped in a double-well potential
We investigate the interplay dynamics of a cavity qed system, where the
two-level atoms are trapped in a double-well potential, and the cavity mode,
with a frequency largely detuned to the atomic level splitting, is driven by a
probe laser. The interaction between the center-of-mass motion of the atoms and
the cavity mode is induced by the position dependent atom-field coupling. The
dynamics of the system is characterized by two distinct time scales, the
inverse of the atomic interwell tunneling rate and the inverse of the cavity
loss rate. The system shows drastically different (quasi) steady behaviors in
the short-time and long-time intervals.Comment: 8 pages, 5 figue
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