Research on the Relationship between Returns and Volume of the Shanghai Composite Index

Over the years, research on the relationship between stock returns and trading volume has been the focus of concern in the financial sector. As a theoretical basis for stock technical analysis, it can provide the necessary theoretical support for the stock market speculators and investors in practice, but also forecast for the economics clues for market researchers. This paper selects the Shanghai Composite Index daily closing price and trading volume from January 5, 2009 to April 26, 2013 as the study sample. We construct a VAR model for an empirical analysis of the relationship between the returns and volume. Through granger causality testing, impulse response and variance decomposition analysis, the results show that the relationship between returns and volume of the Shanghai Composite Index is asymmetrical. Stock price volatility can be used to predict changes in volume.