Guy Stephens: He said, Xi said

Some world leaders conform to historical protocol and rarely tweet, if at all. Others appear to use it outside of their advisers and any official press office - and it is this that can move markets. As an example, various members of the US Federal Reserve have previously hinted at a more hawkish or dovish view on interest rates compared with the chairman's official press release and then markets have seized upon the comment as it has gone viral.  As an investor, it is important to decide what is fact, fiction, off-the-cuff, conjecture or ‘mis-spoken' - the last of which apparently the...