Income distribution dynamics: monotone Markov chains make light work

This paper considers some aspects of the dynamics of income distributions by employing a simple Markov chain model of income mobility. The main motivation of the paper is to introduce the techniques of monotone Markov chains to this field. The transition matrix of a discrete Markov chain is called monotone if each row stochastically dominates the row above it. It will be shown that by embedding the dynamics of the income distribution in a monotone Markov chain, a number of interesting results may be obtained in a straightforward and intuitive fashion.Thanks are due to Peter Lambert and four anonymous referees for very helpful comments.     

Que faut‐il voir dans les écarts de rémunération entre les travailleurs immigrés des pays du Golfe: l'effet d'a priori patronaux ou la simple conséquence de coûts d'opportunité différents?

Les auteurs s'intéressent aux disparités salariales entre les différents groupes de migrants qualifiés qui travaillent en grand nombre pour le secteur privé dans les États du Conseil de coopération du Golfe. Ils se demandent notamment si la prime salariale des Occidentaux (par rapport aux travailleurs venus d'Asie ou d'autres États arabes) découle d'éventuels a priori des employeurs. L'analyse, qui repose sur des données de 2012–2014 et sur deux méthodes de décomposition classiques, infirme l'hypothèse: les caractéristiques observables relatives à la productivité expliquent entre un tiers et trois quarts des écarts; le coût d'opportunité de la migration, supérieur pour les Occidentaux, explique la portion restante.     

Conservative linear programming with mixed multiple objectives

In an ordinary linear program a single objective vector is constructed and one attempts to choose a decision vector to optimize this objective. Often multiple criteria exist or exact estimates for the components of a single objective vector are not entirely clear. For these cases a conservative decision-maker may want to choose an alternative that maximizes the objective value under the worst foreseeable circumstances. Herein we develop a unified framework for applying the maximin criterion to problems with various degrees of uncertainty attached to the objective vector. Three cases are solved via linear programming: (1) Complete Information, (2) Partial Information, and (3) Total Ignorance. It is shown that the functional value of the maximin solution decreases in a convex manner with increasing uncertainty. In addition certain relationships between maximin and efficient solutions are provided. Finally, an extension to integer constrained decision variables is presented.     

Fossil fuel supplies simulation 1972–1979

Fossil fuels are an important source of energy for Ontario Hydro and purchases exceed $100 million per year. This paper describes a computer simulation of the inventory situation over an eight-year period, which is being used to assess the relationship between order flexibility and the target carry-over stocks at the beginning of each shipping season. A simple way of presenting the results for management evaluation is illustrated. Variations of the model are used to assess random influences, such as strikes, and to determine the economic balance between holding costs and stock-outs.     

The Compassion Strategy: Race and the Gender Gap in Campaign 2000

Recent studies have shown that social "compassion" issues, andnot those directly linked to women’s interests, seem todrive the gender gap in presidential vote choice. Some of thesecompassion issues are associated with the plight of racial minoritiesin the media and in the minds of average citizens. Drawing ontheories of gender role socialization, we predict that traditionalpartisan stands on racial issues may help to explain the gendergap. Specifically, we hypothesize that the gap emerges becausemen and women react differently to cues about how compassionatecandidates are toward vulnerable social groups. In one experiment,we manipulate news information regarding George W. Bush’scommitment to blacks versus women. The gender gap is maximizedwhen Bush takes the traditional Republican stance, while itis reduced significantly when Bush espouses a more moderateposition. The gender gap is unaffected by variation in the positionthat Bush takes on women’s issues. In another experiment,we also find that the gender gap emerges when traditional partisanappeals are racialized. Finally, exposure to the 2000 RepublicanNational Convention, with its message of racial inclusion, boostedevaluations of Bush among women but not men.     

Teaching Mands for Information Using “Why” to Children With Autism

The Analysis of Verbal Behavior - Mands for information (MFIs) play an important role in language development and are important for successfully acquiring new information from one’s...     

Teaching a Child With Autism to Mand for Information Using “How”

Children with autism often do not learn to mand for information without structured teaching. Studies have demonstrated that manipulation of establishing operations (EOs), prompts, prompt fading, and differential reinforcement are effective in teaching children with autism to ask "wh" questions such as "what," "who," and "where." To date, no studies have evaluated procedures to teach children with autism to mand for information using "how." Teaching the mand, "how" is uniquely challenging because once the information regarding how to do something is provided, the EO may no longer be present. The following study evaluated a procedure to teach one child with autism to mand for information using "how" to obtain information to complete multiple activities. The results have implications for clinical application and future research on contriving EOs to teach the mand, "how."