Publicado

2014-05-01

Testing the efficiency market hypothesis for the Colombian stock market

Comprobación de la hipótesis de eficiencia del mercado bursátil en Colombia

Palabras clave:

efficient-market hypothesis, random walk, auto-regression, run test, BDS test, LB test and Bartlett test (en)
hipótesis de eficiencia de mercado, caminata aleatoria, autorregresión, pruebas de rachas, prueba BDS, prueba LB e interval (es)

Autores/as

  • Juan Benjamín Duarte-Duarte Universidad Industrial de Santander
  • Juan Manuel Mascareñas Pérez-Iñigo Universidad Complutense de Madrid
  • Katherine Julieth Sierra-Suárez Universidad Industrial de Santander
One of the basic assumptions of asset pricing models (CAPM and APT) is the efficiency of markets. This paper seeks to prove this requirement in its weak form, both for the General Index of the Stock Exchange of Colombia and for the Colombian market's most representative assets. To this end, different statistical methods are implemented to show that stock patterns do not follow a normal distribution pattern. Additionally, when testing the Colombian efficiency market through a series of runs, BDS, LB and Bartlett test, there is no evidence of randomness in the main financial assets except Ecopetrol. Moreover, in the specific case of IGBC there is an improvement in market efficiency from 2008 to 2010, period that coincides with the onset of the global economic crisis.
Uno de los supuestos básicos de los modelos de valoración de activos (CAPM y APT), es la eficiencia de los mercados. El presente trabajo busca comprobar este requisito en su forma débil, tanto al Índice General de la Bolsa de Valores de Colombia como a las acciones más representativas del mercado colombiano. Para tal fin se comprueba por diferentes métodos estadísticos que las series bursátiles no siguen el patrón de una distribución normal. Además, al indagar sobre la eficiencia del mercado colombiano, mediante los test de Rachas, BDS, LB y Bartlett, se evidencia no aleatoriedad en los principales activos financieros con excepción de Ecopetrol, mientras que para el IGBC se observa una mejora en la eficiencia del mercado del 2008 a 2010, periodo que coincide con el inicio de la crisis económica mundial.

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