SIZE-BIASED PERMUTATION OF DIRICHLET PARTITIONS AND SEARCH-COST DISTRIBUTION

2005 ◽  
Vol 19 (1) ◽  
pp. 83-97 ◽  
Author(s):  
Javiera Barrera ◽  
Thierry Huillet ◽  
Christian Paroissin
Keyword(s):  
Search Cost ◽  
Cost Distribution ◽  
The Law ◽  
Dirichlet Partition

Consider the random Dirichlet partition of the interval into n fragments at temperature θ > 0. Explicit results on the law of its size-biased permutation are first supplied. Using these, new results on the comparative search cost distributions from Dirichlet partition and from its size-biased permutation are obtained.

scholarly journals Evidence on search costs under hyperinflation in Brazil: The effect of Plano Real

2020 ◽  
Vol 40 (1) ◽  
pp. 75
Author(s):  
Julia P. Araujo ◽  
Mauro Rodrigues
Keyword(s):  
Consumer Price Index ◽  
Search Costs ◽  
Price Setting ◽  
Search Frictions ◽  
Search Cost ◽  
Order Stochastic Dominance ◽  
Cost Distribution ◽  
The Impact ◽  
The City ◽  
Price Quotes

<p>Plano Real put an end to hyperinflation in 1994 and significantly altered price-setting behavior in Brazil. This paper investigates the impact of Plano Real on search frictions. We estimate a nonsequential search model for homogeneous goods to structurally retrieve consumers' search costs. The dataset comprises 11,673 store-level price quotes collected from 1993 to 1995 by FIPE to calculate the Consumer Price Index (CPI) in the city of São Paulo. The strategy consists of using Plano Real as a structural breakpoint in the data. We estimate the model splitting the data into before (Jan-93 to Jun-94) and after (Aug-94 to Dec-95) the plan, and we find evidence on first-order stochastic dominance of the search-cost distribution of the former into the latter; that is, search costs are higher during hyperinflation. The majority of consumers search only once or twice before buying an item, but this share is marginally higher during hyperinflation (84% vs 79%). In addition, after Plano Real, a larger share of consumers are willing to quote prices in all stores before committing to a purchase. We also document evidence of the effect of the plan on shrinking price-cost margins. When searching is less costly, stores lose market power.</p>

scholarly journals Limiting search cost distribution for the move-to-front rule with random request probabilities

2006 ◽  
Vol 34 (5) ◽  
pp. 557-563 ◽  
Author(s):  
Javiera Barrera ◽  
Thierry Huillet ◽  
Christian Paroissin
Keyword(s):  
Search Cost ◽  
Cost Distribution

scholarly journals Dynamic selection and distributional bounds on search costs in dynamic unit‐demand models

10.3982/qe728 ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 891-929 ◽  
Author(s):  
Jason R. Blevins ◽  
Garrett T. Senney
Keyword(s):  
Population Distribution ◽  
Nonlinear Least Squares ◽  
Search Costs ◽  
Consumer Search ◽  
Parametric Models ◽  
Upper And Lower Bounds ◽  
Small Scale ◽  
Search Cost ◽  
Demand Models ◽  
Cost Distribution

This paper develops a dynamic model of consumer search that, despite placing very little structure on the dynamic problem faced by consumers, allows us to exploit intertemporal variation in price distributions to estimate the distribution from which consumer search costs are initially drawn. We show that static approaches to estimating this distribution may suffer from dynamic sample selection bias. This can happen if consumers are forward‐looking and delay their purchases in a way that systematically depends on their individual search costs. We consider identification of the population search cost distribution using only price data and develop estimable nonparametric upper and lower bounds on the distribution function, as well as a nonlinear least squares estimator for parametric models. We also consider the additional identifying power of weak, theoretical assumptions such as monotonicity of purchase probabilities in search costs. We apply our estimators to analyze the online market for two widely used econometrics textbooks. Our results suggest that static estimates of the search cost distribution are biased upwards, in a distributional sense, relative to the true population distribution. We illustrate this and other forms of bias in a small‐scale simulation study.

scholarly journals Limiting behavior of the search cost distribution for the move-to-front rule in the stable case

2011 ◽  
Vol 81 (12) ◽  
pp. 1827-1832
Author(s):  
Fabrizio Leisen ◽  
Antonio Lijoi ◽  
Christian Paroissin
Keyword(s):  
Search Cost ◽  
Limiting Behavior ◽  
Stable Case ◽  
Cost Distribution

Ethical Challenges: Less About Moral Wrongdoing and More About Communication Breakdown

2015 ◽  
Vol 20 (3) ◽  
pp. 72-84 ◽  
Author(s):  
Paula Leslie ◽  
Mary Casper
Keyword(s):  
Ethical Challenges ◽  
Speech Language Pathology ◽  
Thickened Liquids ◽  
Communication Breakdown ◽  
Professional Duty ◽  
Language Pathology ◽  
The Law ◽  
Personal Case

“My patient refuses thickened liquids, should I discharge them from my caseload?” A version of this question appears at least weekly on the American Speech-Language-Hearing Association's Community pages. People talk of respecting the patient's right to be non-compliant with speech-language pathology recommendations. We challenge use of the word “respect” and calling a patient “non-compliant” in the same sentence: does use of the latter term preclude the former? In this article we will share our reflections on why we are interested in these so called “ethical challenges” from a personal case level to what our professional duty requires of us. Our proposal is that the problems that we encounter are less to do with ethical or moral puzzles and usually due to inadequate communication. We will outline resources that clinicians may use to support their work from what seems to be a straightforward case to those that are mired in complexity. And we will tackle fears and facts regarding litigation and the law.

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