Before revision:  This study, by applying the MF-DXA method , demonstrates that priceand trading volume and their coupling contain power law information and are multifractal in the markets we investigated.
After revision:  This study, by applying the MF-DXA method . Our results imply that price, trading volume, and price-volume coupling exhibit a power law and their coupling contain power law information and are multifractal in the markets we investigated.