Optimal Minimum Wage in a Competitive Economy: an Alternative Modelling Approach

This paper analyzes whether a minimum wage can be an optimal redistribution policy when distorting taxes and lump-sum transfers are also available in a competitive economy. We build a static general equilibrium model with a Ramsey planner making decisions on taxes, transfers, and minimum wage levels. Workers are assumed to differ only in their productivity. We find that optimal redistribution may imply the use of a minimum wage. The key factor driving our results is the reaction of the demand for low skilled labor to the minimum wage law. Hence, an optimal minimum wage appears to be most likely when low skilled households are scarce, the complementarity between the two types of workers is large or the difference in productivity is small. The main contribution of the paper is a modelling approach that allows us to adopt analysis and solution techniques widely used in recent public finance research. Moreover, this modelling strategy is flexible enough to allow for potential extensions to include dynamics into the model.redistribution policy, minimum wage, Ramsey Problem

Registro magmático en el NE de México: una historia desde el precámbrico hasta el cenozoico

El Noreste de México cuenta con extensos y a la vez potentes afloramientos de rocas sedimentarias del Mesozoico al Cenozoico, contenidas en las provincias de la Sierra Madre Oriental, Sierra de San Carlos, Sierra de Tamaulipas, Cuenca de Burgos, etc. Si bien el registro litológico está dominado por litologías carbonatadas y pelíticas, existen complejos en los que se pueden apreciar la presencia de unidades magmáticas, tanto volcánicas como plutónicas, que permiten la interpretación de importantes procesos geodinámicos de diversas etapas entre el Precámbrico hasta el Cenozoico tardío. A continuación se describe una breve compilación de estas secuencias, que será objeto de la charla

Examining the Impact of Innovation Forms on Sustainable Economic Performance: The Influence of Family Management

The aim of this research is to explore the effect that innovation, as a potential source of sustained competitive advantage and firm growth, has on the achievement of sustainable economic performance. In particular, this paper empirically examines the influence of four innovation forms (intramural R&D, extramural R&D, product innovation, and process innovation) on firms’ sustainable economic performance, considering the moderating effect of family involvement in management. To test the hypotheses, random-effects regression analyses are applied to a longitudinal sample of 598 Spanish private manufacturing firms throughout the 2006–2015 period. The results show a negative effect of intramural and extramural R&D on sustainable economic performance and a positive effect of process innovation on sustainable economic performance. Moreover, a reinforced relationship between process innovation and sustainable economic performance is also revealed when family involvement in management acts as a moderator. The findings make several contributions to research and practice

USING DIGITAL STORIES TO IMPROVE LISTENING COMPREHENSION WITH SPANISH YOUNG LEARNERS OF ENGLISH

This paper examines the effects that digital stories may have on the understanding of spoken English by a group of 6-year-old Spanish learners. To accomplish this aim, a quasi-experimental research study was launched in six state schools in Madrid. A pre-post test design was used to investigate whether internet-based technology could improve listening comprehension in English as a Foreign Language (henceforth, EFL). Findings indicate that the experimental group outperformed the control group in the final test administered. These results raise interesting issues related to the use of technology in the context of foreign language learning. Future research which includes other age groups and digital materials and which explores other linguistic areas could further substantiate the link between Information and Communication Technology (ICT) rich environment and improved language learning

Evaluación de la resistencia adhesiva al cizallamiento de 2 sistemas adhesivos a esmalte y dentina de dientes temporales

Tesis (Cirujano Dentista)En este trabajo, se pretende comparar la resistencia adhesiva in vitro mediante pruebas de cizallamiento para sistemas adhesivos de autograbado (self-etch) y de grabado y lavado (etch-and-rinse) en esmalte y dentina de dientes temporales. Con el fin de ayudar en la búsqueda de un sistema adhesivo adecuado para este tipo de sustrato

Mariano Benlliure en la vida y en la obra de Juan Polo

Entrevista realizada al maestro escultor Juan Polo, en su casa-estudio de Fernán Núñez, con motivo de la preparación de su exposición en la Casa Museo Benlliure de Valencia, donde se le quiso honrar como último discípulo vivo del maestro valencian

Bradysia aliciae sp. nov. (Diptera: Sciaridae) from the Pleistocene of Buenos Aires, Argentina

Bradysia aliciae sp. nov .(Diptera: Sciaridae) es descripta a partir de un ala con un excepcional estado de preservación proveniente del afloramiento de Camet Norte en Buenos Aires, Argentina, con una antigüedad de 24500 años A.P. El ejemplar es el primer díptero adulto identificable que proviene de dichos depósitos.Bradysia aliciae sp. nov. (Diptera: Sciaridae) is described from an exceptionally preserved wing extracted from the Camet Norte outcrop in Buenos Aires, Argentina, dated in 24,500 years B.P. The fossil is the very first identifiable imaginal stage of Diptera that came from these deposits.Fil: Ramírez, Leonardo César. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Alonso, Cecilia P.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentin

Propriedades psicométricas de uma escala para medir a gestão da vergonha em adolescentes (Moss-Sast)

(Ahmed, 1999) to measure shame management in adolescents in situations of aggression toward peers. The study was conducted with a sample of 700 students from public secondary schools (N= 700) located in a northwestern state municipality of Mexico. Results enabled to obtain an empirically sustainable measuring model formed by two factors: Acknowledgment and Displacement (X2 = 5.16, p= 0.27; CMIN= 1.29; GFI= .98; CFI= .99; NFI= .97; RMSEA= .05). Evidence was obtained to show that the instrument has criterion validity since it is capable to differentiate between subgroups of students with and without reports of bullying in both factors, Acknowledgment (t= 3.49, gl= 137, p< .001) and Displacement (t= 3.63, gl= 137, p< .001). It was concluded that the results strengthen the original factorial structure of the scale and show the usefulness of the same, both for inquiring about emotions related to moral development and for identifying students involved as aggressors in bullying situations.Se establecieron las evidencias de validez y confiabilidad de la adaptación del cuestionario MOSS-SAST (Ahmed, 1999) para medir el manejo de la vergüenza en adolescentes ante situaciones de agresión hacia los pares. El estudio se realizó en una muestra de estudiantes de escuelas secundarias públicas (N= 700) ubicadas en un municipio de un estado del noroeste de México. Los resultados permitieron obtener un modelo de medición empíricamente sustentable formado por nueve ítems agrupados en dos factores: Reconocimiento y Desplazamiento (c2 = 5.16, p= 0.27; CMIN= 1.29; GFI= .98; CFI= .99; NFI= .97; RMSEA= .05). El instrumento cuenta con evidencias de validez de criterio, ya que establece la diferencia en los factores de reconocimiento (t= 3.49, gl= 137, p< .001) y desplazamiento (t= 3.63, gl= 137, p< .001) en subgrupos de estudiantes con y sin reportes de bullying. Se concluyó que los resultados fortalecen la estructura factorial original de la escala y muestran su utilidad, tanto en la indagación de emociones relacionadas con el del desarrollo moral, como en la identificación de estudiantes involucrados como agresores en situaciones de bullying.Foram estabelecidas as evidências de validade e confiabilidade da adaptação do Questionário MOSS-SAST (Ahmed, 1999) para medir a gestão da vergonha em adolescentes ante situações de agressão contra os pares. O estudo foi realizado com uma amostra de estudantes do ensino fundamental e médio (N=700) de um município do noroeste do México. Os resultados permitiram obter um modelo de medição empiricamente sustentável, formado por nove itens agrupados em dois fatores: reconhecimento e deslocamento (c2 = 5.16, p= 0.27; CMIN= 1.29; GFI= .98; CFI= .99; NFI= .97; RMSEA= .05). O instrumento conta com evidências de validade de critério já que estabelece a diferença nos fatores de reconhecimento (t= 3.49, gl= 137, p< .001) e deslocamento (t= 3.63, gl= 137, p< .001) em subgrupos de estudantes com e sem relatos de bullying. Conclui-se que os resultados fortalecem a estrutura fatorial original da escala e mostram sua utilidade, tanto na indagação de emoções relacionadas com o desenvolvimento moral quanto na identificação de estudantes envolvidos como agressores em situações de bullying

Effects of experimental pool level reduction on Phylloicus pulchrus (Trichoptera: Calamoceratidae) feeding and conspecific behavior from a tropical rainforest stream

&nbsp; Increases in drought occurrence and persistence around the world prompts to the understanding of their effects on natural populations and ecosystem functioning. The main result of drought on streams is the fragmentation of stream ecosystems into isolated pools as streamflow and water depth decrease. There are limited studies on caddisfly response to reduced water levels and their effect on ecosystem functioning. The goal of this study was to evaluate how reductions in water levels, similar to those associated with droughts, influence feeding and conspecific behavior of Phylloicus pulchrus. Laboratory experimental pool reductions, simulating the natural conditions of the species in the El Verde Field Station, Luquillo Experimental Forest, were carried out for two weeks. Four rectangular plastic aquaria were filled to one third with stream water that was maintained aerated. Ten circular plastic chambers (with screen windows) with Guarea guidonea senescent leaves were placed inside each aquarium. Two stream pool levels (normal and low) were simulated with two treatments (experimental and control). Experimental chambers (n=20) contained fourth instar larvae (n=80, 40=normal, 40=low) while control chambers (n=20) did not. The effect of pool level reduction on leaf mass loss, aggressive interactions between larvae (&gt; 25 % of their cases removed), and larval mortality were assessed. Reductions in pool level increased leaf mass loss (ANOVA: F=5.17, p-value=0.03), larval aggressive interactions (Chi square: x2=6.24, n=80, p-value = 0.01), and larval mortality (Chi square: x2=4.51, n=80, p-value = 0.03).This study shows the early response of a tropical caddisfly to an abiotic cue of a drastic environmental change. This research contributes to our scarce knowledge on caddisfly larvae leaf litter processing behavior during early stages of water reductions, such as those caused by droughts.&nbsp; Aumentos en la ocurrencia y persistencia de sequías alrededor del mundo estimulan el entendimiento de sus efectos en las poblaciones naturales y funcionamiento del ecosistema. El principal resultado de las sequías en los ríos es la fragmentación del ecosistema riverino en pozas aisladas a medida que el flujo y la profundidad del agua disminuyen. Hay estudios limitados sobre la respuesta de los tricópteros a reducciones en niveles de agua y su efecto en el funcionamiento del ecosistema. El objetivo de este estudio fue evaluar como reducciones en niveles del agua, similar a las asociadas con sequías, influencian la alimentación y comportamiento conspecífico de Phylloicus pulchrus. Reducciones de pozas en laboratorio simulando condiciones naturales fueron empleadas por dos semanas. Cuatro acuarios plásticos rectangulares fueron llenados a una tercera parte con agua aereada de la quebrada. Dentro de cada acuario se colocaron diez cámaras plásticas circulares (con aperturas de malla) con hojas senescentes de Guarea guidonea. Se simularon dos niveles de pozas (normal y bajo) con dos tratamientos (experimental y control).&nbsp; Las cámaras experimentales (n=20) contenían larvas del cuarto estadío (n=80, 40=normal, 40=bajo) mientras que las del control (n=20) no. Se evaluó el efecto de la reducción de pozas en la pérdida de masa de las hojas, interacciones agresivas (&gt;25 % de su envoltura removida) y mortalidad larval. La reducción en el nivel de las pozas aumentó la pérdida de masa de las hojas (ANOVA: F=5.17, p=0.03), interacciones agresivas (Chi cuadrado: x2=6.24, n=80, p= 0.01), y mortalidad larval (Chi square: x2=4.51, n=80, p= 0.03). Este estudio muestra la respuesta temprana de un tricóptero tropical a una señal abiótica de un cambio ambiental drástico. Esta investigación contribuye al escaso conocimiento sobre el comportamiento de procesamiento de hojarasca en larvas de tricópteros durante etapas tempranas de reducciones de flujo, como las causadas por sequías