Rendimiento Ex-Dividendo Como Indicador De Eficiencia En Un Mercado Emergente: Caso Colombiano 1999-2007 (Ex-dividend Return as Indicator of Efficiency in a Emerging Stock Market: The Case of the Colombian Stock Market 1999-2007)

E. Arroyave, Diego A. Agudelo
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引用次数: 1

Abstract

Se evalua el rendimiento ex-dividendo en acciones colombianas entre 1999 y 2007, periodo que incluye la conformacion en julio de 2001 de la Bolsa de Valores de Colombia, resultado de la integracion de tres bolsas previamente existentes. Contrario a la hipotesis de eficiencia de mercado, se encontraron rendimientos exdividendo positivos y estadisticamente significativos, similares a los evidenciados en diversos mercados internacionales. Se comprueba que los rendimientos ex-dividendo no son explicados en su totalidad por costos de transaccion ni por efectos impositivos. Una estrategia limitada de captura de dividendos, substrayendo dichos costos, habria entregado rendimientos positivos y economicamente importantes entre 2006 y 2007 en las acciones mas liquidas del mercado. Sin embargo, estos rendimientos tienden a disminuir en el periodo de estudio, consistentes con un avance hacia una mayor eficiencia en el mercado accionario colombiano despues de la integracion. Este estudio pone de relieve la importancia de considerar las fricciones en estudios academicos de eficiencia y de evaluacion de estrategias especulativas. (We study the ex-dividend return in the Colombian stock market between 1999 and 2007, period that includes the merger of the former three Colombian stock exchanges in the Bolsa de Valores de Colombia in July 2001. Contrary to the Efficient Market Hypothesis, we found positive and statistically significant ex-dividend returns in the sampled period, only in part explained by transaction cost and tax effects. Moreover, even subtracting transaction costs and tax effects, a dividend capture strategy would have gotten positive and economically sizable returns between 2006 and 2007 in the most liquid stocks. The decrease of those ex-dividend returns is also reported along the studied period, providing evidence of increasing informational efficiency after the merger of the three stock exchanges. Methodologically, this study highlights the importance of accounting for frictions in both academic efficiency studies and in testing speculative strategies by practitioners.)
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除息回报率作为新兴股票市场效率指标:哥伦比亚股市1999-2007年案例分析
本研究的目的是评估哥伦比亚股票在1999年至2007年期间的股息收益率,包括2001年7月哥伦比亚证券交易所的成立,这是合并三个以前存在的交易所的结果。在本研究中,我们分析了市场效率的假设,即在不同的国际市场中,股息收益率是正的和统计上显著的。在这种情况下,股息前的收益可以用交易成本或税收影响来解释。在2006年至2007年期间,市场上最具流动性的股票将获得正的、经济上重要的回报。然而,在研究期间,这些回报往往会下降,这与整合后哥伦比亚股票市场的更高效率一致。然而,在实践中,这两种方法都有很大的不同。(我们研究了1999年至2007年间哥伦比亚股票市场的前股息回报,这段时间包括2001年7月前三家哥伦比亚股票交易所在哥伦比亚证券交易所的合并。与有效市场假设相反,我们发现在抽样期间的前股息回报是正的和统计上显著的,仅部分由交易成本和税收效应解释。此外,即使减去交易成本和税收影响,在2006年至2007年期间,大多数流动性股票的股息获取策略也将获得正的、经济上可衡量的回报。在本报告所述期间,还报告了这些前股息回报的下降情况,这为三家股票交易所合并后信息效率的提高提供了证据。从方法上讲,本研究强调了在学术效率研究和实践者的推测性测试策略中对摩擦进行核算的重要性。)
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