The Persistence of the slave market in seventeenth-century Central Mexico

This study, based on an extensive notarial database, demonstrates the significance of slavery in Central Mexico during the seventeenth century. Thousands of bills of sale from Mexico City and Puebla – the largest and most lucrative slave markets in the region – show that the slave trade did not collapse with the end of the Portuguese asiento in 1640. A growing population of American-born creoles sustained the market during the subsequent decades, along with a modest number of new African arrivals. In 1700, slavery remained integral to Central Mexico's economy.     

Cognition and Behavior in Normal‐Form Games: An Experimental Study

This paper reports experiments designed to study strategic sophistication, the extent to which behavior in games reflects attempts to predict others’ decisions, taking their incentives into account. We study subjects’ initial responses to normal‐form games with various patterns of iterated dominance and unique pure‐strategy equilibria without dominance, using a computer interface that allowed them to search for hidden payoff information, while recording their searches. Monitoring subjects’ information searches along with their decisions allows us to better understand how their decisions are determined, and subjects’ deviations from the search patterns suggested by equilibrium analysis help to predict their deviations from equilibrium decisions.     

A Simple Model of Severance Pay Determination: The Case of Individual Dismissals in Spain

In this article we model the determinants of severance pay for individual dismissals in Spain, following an idea proposed by Jimeno and Toharia (Economistas 55: 243–255, 1993). We point out the importance of severance pay settled before judgment, since the legal framework creates a bargaining space to determine the amount paid by firms in cases of individual dismissal. The model is a simple pre‐trial bargaining game between the firm and the worker. It predicts a higher settled severance pay for dismissals on economic grounds than on disciplinary ones, which could explain the perceptions held about the wide use of disciplinary dismissals in Spain. In addition, this approach could be useful in designing labour market reforms aimed at changing dismissal costs, because it allows us to determine the key variables affecting settled severance pay. Our simple model predicts that the key variables for Spain are the severance pay for unfair dismissal and the probability of unfair dismissal.     

Publication Trends in The Analysis of Verbal Behavior: 1999–2008

The Analysis of Verbal Behavior (TAVB) publishes experimental and theoretical papers relevant to a behavioral analysis of language. Normand, Fossa, and Poling (2000) reviewed the published studies in TAVB across several dimensions and found that despite the growth of the journal, most articles published in TAVB from 1982 to 1998 were nonexperimental. The current study extends this review by analyzing articles published in TAVB from 1999 through 2008. Results showed that 48% of the articles published between 1999 and 2008 were experimental (65% in the last 4 years), 93% of them used within-subject experimental designs, and most of them (54%) included children with developmental disabilities. This suggests an increased interest in the experimental analysis of verbal behavior with a focus on teaching language to individuals with disabilities.     

Sociodemographic Profiles and the Causes of Regular Venezuelan Emigration

The following study examines the characteristics of the Venezuelan emigrant population which crossed the border between Táchira state (Venezuela) and La Parada, Villa del Rosario Municipality, North Santander (Colombia) between April 9th and May 6th of 2018. The data were collected through a structured survey with 14,578 respondents. Using multiple correspondence factor analysis and positioning maps, we identified three different emigrant profiles that have a single fundamental cause of emigration: the current economic situation. These three groups differ in age, education level, and marital status. Profile 3 stands out as it is formed by single, young professionals who feel uncertainty because they do not think they can have a prosperous future in Venezuela. We conclude with an acknowledgement of the current humanitarian crisis (around both food and health) in Venezuela and the need to generate inclusive migratory policies in host countries.     

Feral pigeon (Columba livia var. domestica) management in low-density urban areas: prevention is better than cure

Urban Ecosystems - Currently, there are naturalized populations of feral pigeon (Columba livia var. domestica) worldwide with an estimated global population between 165 and 330 million individuals....     

THE SWINGS OF U.S. INFLATION AND THE GIBSON PARADOX

In recent business cycles, U.S. inflation has experienced a reduction of volatility and a severe weakening in the correlation to the nominal interest rate (Gibson paradox). We examine these facts in an estimated dynamic stochastic general equilibrium model with money. Our findings point at a flatter New Keynesian Phillips Curve (higher price stickiness) and a lower persistence of markup shocks as the main explanatory factors. In addition, a higher interest‐rate elasticity of money demand, an increasing role of demand‐side shocks, and a less systematic behavior of Fed's monetary policy also account for the recent patterns of U.S. inflation dynamics. (JEL E32, E47)     

A literature review about usability evaluation methods for e-learning platforms

The usability analysis of information systems has been the target of several research studies over the past thirty years. These studies have highlighted a great diversity of points of view, including researchers from different scientific areas such as Ergonomics, Computer Science, Design and Education. Within the domain of information ergonomics, the study of tools and methods used for usability evaluation dedicated to E-learning presents evidence that there is a continuous and dynamic evolution of E-learning systems, in many different contexts -academics and corporative. These systems, also known as LMS (Learning Management Systems), can be classified according to their educational goals and their technological features. However, in these systems the usability issues are related with the relationship/interactions between user and system in the user's context. This review is a synthesis of research project about Information Ergonomics and embraces three dimensions, namely the methods, models and frameworks that have been applied to evaluate LMS. The study also includes the main usability criteria and heuristics used. The obtained results show a notorious change in the paradigms of usability, with which it will be possible to discuss about the studies carried out by different researchers that were focused on usability ergonomic principles aimed at E-learning.     

Analysis of mental workload of electrical power plant operators of control and operation centers

Electrical systems can be categorized as critical systems where failure can result in significant financial loss, injury or threats to human life. The operators of the electric power control centers perform an activity in a specialized environment and have to carry it out by mobilizing knowledge and reasoning to which they have adequate training under the terms of the existing rules. To reach this there is a common mental request of personnel involved in these centers due the need to maintain attention, memory and reasoning request. In this sense, this study aims to evaluate the Mental Workload of technical workers of the Control Centers of Electrical Energy. It was undertaken a research on operators control centers of the electricity sector in Northeast Brazil. It was used for systematic observations, followed by interview and application of the instrument National Aeronautics and Space Administration Task Load Index known as NASA-TLX. As a result there will be subsidies for an assessment of mental workload of operators, and a contribution to improving the processes of managing the operation of electric utilities and the quality of workers.     

Spanish version of the Objectified Body Consciousness Scale (OBCS): results from two samples of female university students / Versión española de la Objectified Body Consciousness Scale (OBCS): resultados correspondientes a dos muestras de estudiantes universitarias

Self-objectification happens when people internalize a view of themselves as an object or collection of body parts. Two studies were conducted to validate the Spanish version of the Objectified Body Consciousness Scale (OBCS). This scale assesses self-objectification through three components: body surveillance, body shame and appearance control beliefs in women. In Study 1 and Study 2, 218 and 201 female undergraduate students, respectively, responded to the Spanish version of this scale and other related measures. In Study 2, they also reported on their emotions after being exposed to an objectifying scenario. The three subscales of the Spanish version of the OBCS showed acceptable indices of internal consistency (ranging between α = .68 to .84), and the confirmatory factor analysis showed a three-factor solution to be the most appropriate. Adequate convergent validity was found with respect to the Self-Objectification Questionnaire (SOQ) and other variables such as self-esteem, other-directedness, hostile sexism and enjoyment of sexualization. These findings suggest that the Spanish version of the OBCS is a satisfactory measure of college women’s self-objectification.