China to double deposit for stock margin trading: exchange

China will double the deposit required for investors to borrow funds to trade stocks –- known as margin trading -- the Shanghai stock exchange said Friday, as authorities seek to limit a practice that created a massive market bubble. Both the Shanghai and Shenzhen stock exchanges will increase the minimum requirement for margin trading to 100 percent from 50 percent, the Shanghai bourse said on its official microblog. Margin trading was behind a stock market rally that sent the Shanghai in