Stamp duty hike sends warning to Chinese investors May 30 2007 X LinkedIn Email Show more sharing options Copy Link URLCopied! Print X LinkedIn Email China's tripling of stamp duty on shares is a signal that the government will act to cool what it perceives as the overheating the mainland's two stock markets. Unlock this content. The content you are trying to view is exclusive to our subscribers. To unlock this content: Take a Free Trial or Login