GOOD NEWS, BAD NEWS, VOLUME, AND THE MONDAY EFFECT
发现1962-1986年间美股周一效应只出现在市场回报为负的时期，且与高于正常水平的交易量相关，该情况仅占样本期的2%。
New evidence is presented on the nature of the Monday effect in stock market returns. Using stock returns for the years 1962‐1986, the Monday effect is found to be confined to periods of negative market returns. Monday's returns are no different from other weekday returns in periods of positive returns. In addition, trading volume and the Monday effect are related. Monday's volume is lower than the other weekdays. When returns are compared controlling for trading volume, we find that the Monday effect is confined to negative return periods with above normal volume, which represent only two per cent of the sample period.