Stock return cross-autocorrelations and market conditions in Japan
We show that changes in market conditions significantly affect cross-autocorrelations and speed of adjustment in weekly stock returns. We find significant positive cross-autocorrelations between weekly returns on a portfolio of small firms and lagged large-firm portfolio returns only when the lagged aggregate market has experienced a decline in value. These positive-return cross-autocorrelations are also associated with lower abnormal portfolio trading volume and greater delays in the adjustment of individual stock prices to ( negative) market-wide information, particularly for small firms. The effect of lagged market states cannot be explained by market microstructure biases such as nonsynchronous trading or thin trading.