724 research outputs found
Advertising and pricing at multiple-output firms: evidence from U.S. thrift institutions
We derive five hypotheses regarding market competition, price, and advertising from a theoretical model of a profit maximizing depository institution, and test these conjectures in a simultaneous system of deposit interest rates and advertising expenditures for a data panel of 1,867 thrift institutions that offer 13 different deposit products in 666 local markets in the U.S. between 1994 and 2000. We find some support for each of our hypotheses â branding, information, Dorfman-Steiner, structure-advertising, and structure-price â with the strength of the results often depending on the attributes of the deposit products or the characteristics of the thrifts.Advertising ; Thrift institutions
Bank imputed interest rates: unbiased estimates of offered rates?
We examine whether âimputedâ interest rates obtained from bank financial statements are unbiased estimates of âofferedâ interest rates that the same banks report in surveys. We find evidence of a statistically significant amount of bias. However, the statistical bias that we document does not appear to be economically significant. When used as dependent variables in regression analysis, imputed rates and offered rates lead to the same policy conclusions. Our work has important methodological implications for empirical research that examines the product market competition among depository institutions.Interest rates
Impulzustérbeli sƱrƱségmåtrix-renormålåsicsoport-algoritmus fejlesztése és alkalmazåsa fermion modellekre. = Development and application of momentum space density matrix renormalization group method for fermion models
Az OTKA pĂĄlyĂĄzat kutatĂĄsi tervĂ©nek megfelelĆen a nĂ©gyĂ©ves idĆszak alatt a sƱrƱsĂ©gmĂĄtrixos renormĂĄlĂĄsicsoport-algoritmus (DMRG) szĂĄmos fejlesztĂ©sĂ©t vĂ©geztĂŒk el, kivĂĄltkĂ©ppen a kvantuminformĂĄciĂł-elmĂ©let (QIT) összefĂŒggĂ©seinek alkalmazĂĄsa mellett. E kĂ©t terĂŒlet kapcsolatĂĄt legjobban leĂrĂł Ășn. összefonĂłdottsĂĄgot, mely egyben a kvantumos rendszerek alapvetĆ tulajdonsĂĄgait is megszabĂł mennyisĂ©g, hatĂ©konyan alkalmaztuk spin Ă©s fermionrendszerek vizsgĂĄlatĂĄra rövid Ă©s hosszĂș tĂĄvĂș kölcsönhatĂĄsok figyelembevĂ©tele mellett. KutatĂĄsaink mindezek tĂŒkrĂ©ben interdiszciplinĂĄris jellegƱek voltak, melyet jĂłl tĂŒkröznek az ĂĄltalunk vizsgĂĄlt szilĂĄrdtestfizikai, kvantumkĂ©miai Ă©s statisztikus fizikai problĂ©mĂĄk. A numerikus vizsgĂĄlatok mellett szĂĄmos esetben elvĂ©geztĂŒk a modellek analitikus mĂłdszerekkel valĂł közelĂtĂ©sĂ©t is, Ăgy vĂ©gsĆ megĂĄllapĂtĂĄsainkat az analitikus predikciĂłk Ă©s numerikus szĂĄmĂtĂĄsok egyĂŒttesekĂ©nt alakĂtottuk ki. Fontos megjegyezni, hogy vilĂĄgszinten - legjobb tudomĂĄsom szerint - mindösszesen hat olyan DMRG kĂłd lĂ©tezik, mely hosszĂș tĂĄvĂș kölcsönhatĂĄsok kezelĂ©sĂ©t is lehetĆvĂ© teszi. | In the past for years we have developed the most general version of the densitymatrix-renormalization group (DMRG) method treating non local interactions and implemented various concepts of quantum information theory (QIT) in order to optimize the RG procedure. Quantum systems with short and long ranged interactions have been studied with great success. Models of such fields include mixed-stack compounds, quantum chemical systems, various spin systems in one dimensions. We have also analyzed quantum fluctuations between subsystems and defined an effective temperature to describe such effects. In addition, we have developed new methods based on the entanglement between subsystems to detect and locate quantum phase transition
Simulating Strongly Correlated Quantum Systems with Tree Tensor Networks
We present a tree-tensor-network-based method to study strongly correlated
systems with nonlocal interactions in higher dimensions. Although the
momentum-space and quantum-chemistry versions of the density matrix
renormalization group (DMRG) method have long been applied to such systems, the
spatial topology of DMRG-based methods allows efficient optimizations to be
carried out with respect to one spatial dimension only. Extending the
matrix-product-state picture, we formulate a more general approach by allowing
the local sites to be coupled to more than two neighboring auxiliary subspaces.
Following Shi. et. al. [Phys. Rev. A, 74, 022320 (2006)], we treat a tree-like
network ansatz with arbitrary coordination number z, where the z=2 case
corresponds to the one-dimensional scheme. For this ansatz, the long-range
correlation deviates from the mean-field value polynomially with distance, in
contrast to the matrix-product ansatz, which deviates exponentially. The
computational cost of the tree-tensor-network method is significantly smaller
than that of previous DMRG-based attempts, which renormalize several blocks
into a single block. In addition, we investigate the effect of unitary
transformations on the local basis states and present a method for optimizing
such transformations. For the 1-d interacting spinless fermion model, the
optimized transformation interpolates smoothly between real space and momentum
space. Calculations carried out on small quantum chemical systems support our
approach
Second-order Peierls transition in the spin-orbital Kumar-Heisenberg model
We add a Heisenberg interaction term in the one-dimensional
SU(2)XY spin-orbital model introduced by B. Kumar. At the
spin and orbital degrees of freedom can be separated by a unitary
transformation leading to an exact solution of the model. We show that a finite
leads to spontaneous dimerization of the system which in the
thermodynamic limit becomes a smooth phase transition at ,
whereas it remains discontinuous within the first order perturbation approach.
We present the behavior of the entanglement entropy, energy gap and
dimerization order parameter in the limit of confirming the
critical behavior. Finally, we show the evidence of another phase transition in
the Heisenberg limit, , and give a qualitative analytical
explanation of the observed dimerized states both in the limit of small and
large .Comment: 11 pages, 12 figure
The Challenge of the Commons in the Post-Socialist Era
Since the neo-liberal turn of the 1970s and the consequent failure of the state socialist experiment, the functioning of the Eastern European states has increasingly been governed by the rationality of markets. This logic has led to an erosion of the concept of the commons and, by extension, universality. The notion of then alternative but now mainstream culture creates and serves particular class interests under the banner of âindependenceâ and âfreedomâ, which aims not to transcend the status quo but to preserve it and the property relations on which it is based. My thesis is written as a first step to reclaim the idea of the commons, pointing to the capitalist genesis of the forms in our contemporary culture
Condition of Public Primary Schools in Terms of Emotional Social Support and Parentsâ Learning Needs Parallel to This Subject
This research aims to determine the public primary schoolsâ conditions in terms of emotional social support and parentsâ learning needs regarding this subject in the Manavgat County of Antalya City. The universe of this model which was conducted through scanning model was consisted of parents who have children attending to the public primary schools in the Manavgat County. The data was collected from the sampling set that was consisted of 384 parents. In interpretation of the collected data, frequency, percentage and chi-square methods were utilized. It was determined that almost all of the parents were in positive attitude regarding emotional support for their children. However, it was also understood that there were some parents who cannot provide sufficient support which cannot be ignored in number and they were in need in terms of emotional social support. Keywords: Emotional Support , Parental involvement, Student Achievement , Adult Educatio
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