Day of the week anomaly (Monday Effect) – How to do it?
Day of the week anomaly or more known as Monday Effect is one of calendar anomalies in financial market. It states that the stock market returns on Monday is significantly different from other day. This anomaly is proposed by Kenneth French in 1980, and his research paper was published in Journal of Financial Economics. The appearance of Monday Effect is an evidence of market inefficiency. Yet, in French (1980) paper, he suggested an arbitrage profit or mispricing profit from this anomaly. He further surmises “Although an active trading strategy based on the negative expected returns would not have been profitable because of transactions costs, investors could have Increased their expected returns by altering the timing of trades which would have been made anyway – delaying purchases for Thursday Friday until sales scheduled Monday on preceding Friday”