History of share prices and market efficiency of the Madrid general stock index

We apply Moving Average (MA), Relative Strength Indicator (RSI), Moving Average Convergence Divergence (MACD), and trading breakout (TBO) techniques to investigate the weak-form market efficiency of the Madrid General Stock Index, Índice General de la Bolsa de Madrid (IGBM), from 1/2/1975 to 12/31/2012. The empirical results not only strongly validate the predictive power of trading rules with robust statistical significance in all three sub-periods over the thirty-eight years, but also provide the possible strategies to outperform the buy-and-hold strategy with the consideration of transaction costs and risk. This supports the argument against weak-form market efficiency of the IGBM.