Day of the week effect on the Greek stock market

Evidence is presented concentrating on the day of the week effect on the Greek stock market, which is currently in a transitory stage. The analysis carried out takes into account that the variance is dependent over time, while an EGARCH-M model investigates the volatility which is considered non-constant over time. During the period examined, January 1985 to February 1994 this market is divided into two subperiods, one in which it operated under backward statutory conditions and the recent one, that is since 1988, during which significant changes have been introduced affecting all market players. A positive return is found for Mondays when the total period is examined, as well as in the first subperiod. Tuesdays, on the other hand, show negative returns. The recent changes, however, since 1988 have established a new pattern of returns which comes closer to that of most other national stock markets. Factors relating to the degree of order established in this market in combination with human behaviour patterns are used to explain these findings. On the side of moments, both preliminary evidence and further investigation of the dependencies depict a changing pattern as well. © 1995, Taylor & Francis Group, LLC. All rights reserved.