A Shortage of Tools for Betting Against China

``China's roller-coaster stock market is increasingly open to the world's investors--so long as they don't want to bet against it... "If you want to go short on A-shares, it's very difficult," said Kinger Lau, chief China strategist for Goldman Sachs Group Inc. "The market has been pretty one-sided. Everyone is long and everyone is using leverage to increase their exposure. That has amplified the magnitude and the speed of the rally."''