Facultad de Economía
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- ÍtemAcceso AbiertoA DSGE model with loss aversion in consumption and leisure: an explanation for business cycles asymmetries(2014-04) Gómez Muñoz, Wilman ArturoIn this chapter, an asymmetric DSGE model is built in order to account for asymmetries in business cycles. One of the most important contributions of this work is the construction of a general utility function which nests loss aversion, risk aversion and habits formation by means of a smooth transition function. The main idea behind this asymmetric utility function is that under recession the agents over-smooth consumption and leisure choices in order to prevent a huge deviation of them from the reference level of the utility; while under boom, the agents simply smooth consumption and leisure, but trying to be as far as possible from the reference level of utility. The simulations of this model by means of Perturbations Method show that it is possible to reproduce asymmetrical business cycles where recession (on shock) are stronger than booms and booms are more long-lasting than recession. One additional and unexpected result is a downward stickiness displayed by real wages. As a consequence of this, there is a more persistent fall in employment in recession than in boom. Thus, the model reproduces not only asymmetrical business cycles but also real stickiness and hysteresis.
- ÍtemAcceso AbiertoA firm-level analysis of ICT adoption in an emerging economy: evidence from the colombian manufacturing industries(2011-12) Gallego Acevedo, Juan Miguel; Gutiérrez Ramírez, Luis Hernando; Sang, LeeThis study examines ICT adoption among 3,759 Colombian manufacturing firms, and attempts to identify the factors that are conducive to the adoption and usage of ICT at the firm level. Our major findings are (i) that the adoption of a given information and communication technology is better facilitated when a firm is relatively large, has large human capital, engages in more innovative activities, and when a firm’s organizational structure is better aligned with the given technology; (ii) that positive associations between the key determinants and ICT adoptions are more pronounced for small and medium-sized firms than for large ones, and (iii) that information spillovers within industries is also a determinant of ICT adoptions by the firms.
- ÍtemAcceso AbiertoA jump telegraph model for option pricing(2004-11) Ratanov, NikitaIn this paper we introduce a financial market model based on continuos time random motions with alternanting constant velocities and with jumps ocurring when the velocity switches. if jump directions are in the certain corresondence with the velocity directions of the underlyng random motion with respect to the interest rate, the model is free of arbitrage. The replicating strategies for options are constructed in details. Closed form formulas for the opcion prices are obtained.
- ÍtemAcceso AbiertoA model of school behavior: tuition fees and grading standards(2008) Maldonado, DarioThis paper uses a hybrid human capital / signaling model to study grading standards in schools when tuition fees are allowed. The paper analyzes the grading standard set by a profit maximizing school and compares it with the efficient one. The paper also studies grading standards when tuition fees have limits. When fees are regulated a profit maximizing school will set lower grading standards than when they are not regulated. Credit constraints of families also induce schools to lower their standards. Given that in the model presented competition is not feasible, these results show the importance of regulation of grading standards.
- ÍtemAcceso AbiertoA Modest Proposal to Clarify the Status of Coca in the United Nations Conventions(2005-03) Thoumi, Francisco E.The implementation of anti-drug policies that focus on illicit crops in the Andean countries faces many significant obstacles, one of which is the cultural clash it generates between the main stakeholders. On the one hand one finds the governments and agencies that attempt to implement crop substitution and eradication policies and on the other the peasant and natives communities that have traditionally grown and used coca or those peasants who have found in coca an instrument of power and political leverage that they never had before. The confrontation about coca eradication, alternative development and other anti-drug policies in coca growing areas transcends drug related issues and is part of a wider and deeper confrontation that reflects the long-term unsolved conflicts of the Andean societies. All Andean countries have stratified and fragmented societies in which peasants and Indians have been excluded from power. In Bolivia, Ecuador and Peru most peasants belong to native communities many of which have remained segregated from “white” society. The mixing of the races (mestizaje) in Colombia occurred early during the Conquest and Colony. Those of Indian descent became subservient to the Spanish and Creoles. The society that evolved was (and still is) highly hierarchical, authoritarian, and has subjacent racist values. The resulting political system has been exclusionary of large portions of the population. Among Indian communities coca has been used for millennia and its use has become an identity symbol of their resistance against what may be looked at as foreign invasion. “The Andean Indian chews coca because that way he affirms his identity as son and owner of the land that yesterday the Spaniard took away and today the landowner keeps away from him. To chew coca is to be Indian...and to quietly and obstinately challenge the contemporary lords that descend from the old encomenderos and the older conquistadors” (Vidart, 1991: 61, author’s translation). In Andean literature on illegal drugs as well as in seminars, colloquia and other meetings where drug policies are debated, complaints are frequently expressed about the treatment of coca in the same category as cocaine, heroin, morphine amphetamines and other “hard” drugs. The complainants assert that “coca is not cocaine” and that it is unfair to classify coca, a nature given plant which has been used for millennia in the Andes without significant negative effects on users, in the same category as man made psychotropic drugs. They also argue that coca has manifold social and religious meanings in indigenous cultures, that coca is sacred and that the requirement of the1961 Single Convention demanding that Bolivia and Peru completely eradicate coca within 25 years is limiting Indigenous communities in their freedom to practice their religions. In most debates about drug interdiction, the views of those who oppose that approach are not accepted as legitimate. Indeed, “prohibitionists” demonize drugs and those who oppose drug policies in Latin America frequently demonize the United States as the imperialist power that imposes them. This dual polarization is a main obstacle to establish a meaningful policy debate aimed at broadening the policy consensus necessary for successful policy implementation. This essay surveys the status of coca in the United Nations Conventions, explains why it is confusing, and how a few changes would eliminate some of the sources of conflict and help organize and control licit coca markets in the Andes. The current disorganized and weakly controlled legal coca market in Peru has been analyzed to demonstrate its deficiencies and to illustrate possible improvements in international drug control policies.
- ÍtemAcceso AbiertoA Network model of systemic risk : identifying the sources of dependence across institutions(2012) Castro, Carlos; Ordóñez Herrera, Juan SebastiánWe design a financial network model that explicitly incorporates linkages across institutions through a direct contagion channel, as well as an indirect common exposure channel. In particular, common exposure is setup so as to link the financial to the real sector. The model is calibrated to balance sheet data on the colombian financial sector. Results indicate that commercial banks are the most systemically important financial institutions in the system. Whereas government owned institutions are the most vulnerable institutions in the system.
- ÍtemAcceso Abierto¿A quiénes afecta el desempleo? análisis de la tasa de incidencia en Colombia(2008) Forero Ramírez, Nohora Yulieth; García Suaza, Andrés Felipe; Guataquí, JuanEl análisis de la dimensión de riesgo en el estudio del desempleo, complementa el estudio de aspectos como su tipología, la importancia de la intermediación laboral o la vulnerabilidad de ciertos grupos. En este sentido, la tasa de incidencia representa un indicador compuesto que tiene en cuenta el volumen de desempleados y la persistencia en este estado mediante la incorporación de la duración media del desempleo. El análisis de la tasa de incidencia permite caracterizar de manera más completa a quienes tienen una mayor probabilidad de entrar en el desempleo o permanecer en esta situación. . Se encuentra que en Colombia existen diferencias significativas entre la tasa de desempleo y la tasa de incidencia, lo que implica que la situación del mercado de trabajo no sólo se explica por el efecto que los choques económicos tienen sobre la composición de la oferta y demanda de trabajo sino también por los fenómenos de duración en los diferentes estados laborales. Estos eventos se pueden considerar igualmente importantes para explicar la dinámica de corto y mediano plazo del mercado laboral.
- ÍtemAcceso Abierto¿A quiénes afecta el desempleo? análisis de la tasa de incidencia en Colombia(2008-06) Nohora, Forero R.; García Suaza, Andrés Felipe; Guataquí, JuanEl análisis de la dimensión de riesgo en el estudio del desempleo, complementa el estudio de aspectos como su tipología, la importancia de la intermediación laboral o la vulnerabilidad de ciertos grupos. En este sentido, la tasa de incidencia representa un indicador compuesto que tiene en cuenta el volumen de desempleados y la persistencia en este estado mediante la incorporación de la duración media del desempleo. El análisis de la tasa de incidencia permite caracterizar de manera más completa a quienes tienen una mayor probabilidad de entrar en el desempleo o permanecer en esta situación. Se encuentra que en Colombia existen diferencias significativas entre la tasa de desempleo y la tasa de incidencia, lo que implica que la situación del mercado de trabajo no sólo se explica por el efecto que los choques económicos tienen sobre la composición de la oferta y demanda de trabajo sino también por los fenómenos de duración en los diferentes estados laborales. Estos eventos se pueden considerar igualmente importantes para explicar la dinámica de corto y mediano plazo del mercado laboral.
- ÍtemAcceso AbiertoA segmented and observable Yield Curve(2019-11-01) Castro, Carlos; Peña, Juan Felipe; Rodriguez Revilla, Cristhian Andres; Grupo de Investigaciones. Facultad de Economía. Universidad del RosarioSiguiendo a Almeida et al. (2018) implementamos un modelo segmentado de Nelson-Siegel de tres factores para la estructura a plazos, utilizando precios diarios de los TES en pesos y la tasa interbancaria de referencia para Colombia. La estimación flexible de cada segmento de la curva (corto, medio y largo) proporciona una ventaja sobre el modelos clásico de Nelson y Siegel en el momento de realizar pronósticos dentro y fuera de la muestra. Un modelo segmentado basado en los datos directos de los bonos proporciona un aproximación mas cercana a las necesidades de los profesionales en la industria en términos de su capacidad para reproducir los precios del mercado y permitir choques locales en los diferentes segmentos de la curva de rendimientos.
- ÍtemAcceso AbiertoA simple test of momentum in foreign exchange markets(2011-03) García Suaza, Andrés Felipe; Gómez González, Juan EduardoThis study proposes a new method for testing for the presence of momentum in nominal exchange rates, using a probabilistic approach. We illustrate our methodology estimating a binary response model using information on local currency / US dollar exchange rates of eight emerging economies. After controlling for important variables a§ecting the behavior of exchange rates in the short-run, we show evidence of exchange rate inertia; in other words, we Önd that exchange rate momentum is a common feature in this group of emerging economies, and thus foreign exchange traders participating in these markets are able to make excess returns by following technical analysis strategies. We Önd that the presence of momentum is asymmetric, being stronger in moments of currency depreciation than of appreciation. This behavior may be associated with central bank intervention
- ÍtemAcceso AbiertoA survey on colombian agriculture during the 1990s(2002) Arguello, RicardoThis survey reviews some of the key developments in Colombian agriculture during the 1990s. While economic reform and macro policy appear to largely determine the evolution of the sector throughout most of the decade, the impact of sectoral policy is not that clear. The long-run significance of changes brought about in the structure of agricultural production, trade balance, and social conditions in rural areas is unclear. Whether they are the product of a transitional period between two macro and sectoral policy perspectives, of a temporarily distorted set of incentives, or a combination of the two is an open question. Hopefully, a set of interrogations may arise that help improve our understanding of Colombian agriculture.
- ÍtemAcceso AbiertoA Theory of Armed Clientelism(2018-03-14) Gallego Durán, Jorge Andrés; Facultad de EconomíaArmed clientelism is a particular form of patronage in which politicians and non-state armed groups establish a symbiotic relationship where the former provides economic resources, judicial protection, or other benefits, while the latter provides political support and votes. In this paper a theory of armed clientelism is presented, which shows that when politicians establish illegal alliances with armed groups and mafias, they face a political tradeoff: illegal alliances augment the probability of being elected, but generate the risk of being removed from office. The model predicts that in a context in which a mafia controls a district or a town, armed clientelism is more likely when social diversity among the constituency is high, the judicial system is inefficient, party identification of citizens to clientelistic parties is low, and candidates are highly budget-constrained. It also shows that armed clientelism is more likely when the illegal group and the machine are ideologically aligned.
- ÍtemAcceso AbiertoAcademic achievement in sciences: the role of preferences and educative assets(2010) Gamboa Niño, Luis Fernando; Rodríguez Acosta, Mauricio Andrés; García Suaza, Andrés FelipeThis paper provides new evidence on the effect of pupil’s self-motivation and academic assets allocation on the academic achievement in sciences across countries. By using the Programme for International Student Assessment 2006 (PISA 2006) test we find that both explanatory variables have a positive effect on student’s performance. Self-motivation is measured through an instrument that allows us to avoid possible endogeneity problems. Quantile regression is used for analyzing the existence of different estimated coefficients over the distribution. It is found that both variables have different effect on academic performance depending on the pupil’s score. These findings support the importance of designing focalized programs for different populations, especially in terms of access to information and communication technologies such as internet.
- ÍtemAcceso AbiertoAcceso de los hogares a los principales servicios públicos y sociales y percepciones de calidad sobre estos servicios(2005-10) Acosta Navarro, Olga Lucía; Guerra Forero, José Alberto; Rivera Palacio, David MauricioSe presenta los principales resultados de la Encuesta de Calidad de Vida 2003 sobre los servicios públicos domiciliarios y los servicios sociales en Colombia, el análisis se hace comparativo con el año 1993 y 1997 tanto a nivel geográfico como a nivel socioeconómico. Se encuentra que a pesar del decremento en el ingreso que sufrieron los hogares, la calidad de vida de estos no ha decrecido. El acceso a los servicios domiciliarios ha mejorado con algunas brechas entre regiones. En educación han disminuido las tasas de analfabetismo junto con incrementos en la cobertura de la educación primaria y secundaria, sobre todo en lo ingresos bajo y medios. La matrícula superior continúa su baja y la oficial presenta una mayor participación. En materia de salud, el régimen subsidiado se convierte en un importante mecanismo anticíclico.
- ÍtemAcceso AbiertoAcción colectiva y políticas públicas(2007) Villaveces-Niño, Marta-JuanitaEl presente documento hace una revisión de la literatura reciente (últimos 15 años) que vincula la acción colectiva con las políticas públicas. En particular se observan dos tendencias, de un lado, la defensa a la lógica de la acción colectiva señalando el tipo de incentivos que se deben crear para propiciar la cooperación y eventualmente tener resultados de políticas públicas, y aquellos que piensan que la acción colectiva depende de elementos psicológicos y sociales que no siempre garantizan una cooperación constante y que dificultan predecir lo que puede suceder en términos de políticas públicas. Al final se concluye que, si bien la lógica de la acción colectiva contribuye al análisis de las políticas públicas, aún falta un mejor entendimiento de las razones que motivan o frenan la cooperación y la manera como esta se construye en función de un problema colectivo que se puede o no convertirse en una política pública.
- ÍtemAcceso AbiertoAcompañamiento de la ciencia colombiana a las políticas públicas(2004) Riaga Guerrero, Sergio; Villa, Ana; Velasco, MaríaEste artículo analiza el acompañamiento que la investigación científica promovida por COLCIENCIAS ha realizado a las políticas públicas en Colombia, en especial las referidas al bienestar social. A través de un doble análisis cualitativo y cuantitativo, se evalúa la distribución y la cobertura temática de algunas de las investigaciones realizadas entre 1990 y 2002, en los diversos tópicos asociados con las políticas públicas sociales. Aquí se propone un esquema básico para identificar los principales tópicos de desarrollo social alrededor de las cuales el Estado y los gobiernos nacionales proponen y aplican políticas públicas para el bienestar social. Posteriormente, se hace una clasificación de los proyectos en cada uno de esos ejes temáticos, midiendo la distribución y la cobertura de las investigaciones sibre estos ejes. Por último, se presentan las conclusiones y se señalan algunos aspectos metodológicos que habría que considerar para mejorar los estudios sobre el acompañamiento e impacto de la ciencia a las políticas públicas.
- ÍtemAcceso AbiertoLa administración cuantitativa del riesgo financiero en la provisión de un plan de salud(2014-08-22) Castro, CarlosEl diseño del sistema de seguridad social en salud y su efectiva implementación es uno de los más grandes retos de la sociedad, y a su vez es la principal garantía del goce efectivo del derecho a la salud. Un gran desafío de estos sistemas es la administración del riesgo financiero implícito en la provisión de los servicios de salud. Este documento ilustra en qué medida este desafío se puede enmarcar dentro de un problema de administración cuantitativa de los riesgos financieros. Si bien el uso de estas herramientas no son nuevas en el diseño del sistema de seguridad social en salud colombiano, es importante dar claridad sobre el alcance que han tenido estas herramientas, las posibles mejoras que se puedan hacer y los desafíos, en la gestión de estos riesgos, implícitos en la reforma actual de la institucionalidad del sistema.
- ÍtemAcceso AbiertoAgricultural sector and competition in Colombia(2007-11) Arguello, Ricardo; Lozano O., María ClaraIn this chapter we provide a summary description of Colombian Competition Policy with an emphasis on the agricultural sector. Key developments and recent changes in institutional arrangements affecting competition policy, as it applies to the agricultural sector, are highlighted. Illustrative case studies are depicted to show the richness and complexity of policy developments and enforcement. Some general conclusions are drawn from this examination.
- ÍtemAcceso AbiertoAhorro para el retiro en Colombia: patrones y determinantes(2009) Guataquí, Juan; Rodríguez Acosta, Mauricio Andrés; García Suaza, Andrés FelipeLa decisión de los individuos acerca del ahorro para el retiro ha sido abordada teóricamente bajo la hipótesis de que el sistema de seguridad social se comporta como un sustituto de otros mecanismos de ahorro. Este documento presenta evidencia de los patrones y determinantes del ahorro para el retiro en Colombia a partir de la Gran Encuesta Integrada de Hogares de 2007. Los resultados muestran que el 63% de los ocupados declaran no ahorrar para su vejez. A partir de modelos de selección discreta se encuentra que individuos jóvenes, de sexo masculino, con menor nivel educativo, residentes en zonas rurales, y trabajadores cuenta propia, presentan menores probabilidades de ah orrar para el retiro; además las características socioeconómicas resultan significativas en la determinación del mecanismo de ahorro utilizado.
- ÍtemAcceso AbiertoAllocation rules on networks(2012-03) Ilkiliç, Rahmi; Kayi, CagatayWhen allocating a resource, geographical and infrastructural constraints have to be taken into account. We study the problem of distributing a resource through a network from sources endowed with the resource to citizens with claims. A link between a source and an agent depicts the possibility of a transfer from the source to the agent. Given the supplies at each source, the claims of citizens, and the network, the question is how to allocate the available resources among the citizens. We consider a simple allocation problem that is free of network constraints, where the total amount can be freely distributed. The simple allocation problem is a claims problem where the total amount of claims is greater than what is available. We focus on consistent and resource monotonic rules in claims problems that satisfy equal treatment of equals. We call these rules fairness principles and we extend fairness principles to allocation rules on networks. We require that for each pair of citizens in the network, the extension is robust with respect to the fairness principle. We call this condition pairwise robustness with respect to the fairness principle. We provide an algorithm and show that each fairness principle has a unique extension which is pairwise robust with respect to the fairness principle. We give applications of the algorithm for three fairness principles: egalitarianism, proportionality and equal sacrifice.