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Non-linear dependencies in African stock markets: Was subprime crisis an important factor?

Ferreira, P., A. Dionísio, J. Correia (2018), "Non-linear dependencies in African stock markets: Was subprime crisis an important factor?", Physica A: Statistical Mechanics and its Applications, 505, 680-687.
Abstract:

The historical dependence in stock markets it is a very explored issue, especially in developed markets. In this paper we try to address the question of global dependency in African stock markets, and for that purpose we use a global approach able to capture the long-term dependencies being linear or non-linear ones. Are there significant differences in terms of results compared to the major international markets? Results point to an affirmative answer. The Hurst exponent shows that long-term dependence is probably linked not only to size or liquidity.