Ringing the opening bell at the New York Stock Exchange yesterday was first lady Melania Trump, framed behind a huge screenshot of the documentary ‘Melania’. There are three stock market indexes monitored closely in the US. A big question for UK investors is why most shares on the London stock markets fail to attract New York valuations. The Government, regulators and the London exchange have sought to address the issue by sweeping away regulations. They need to look across the Atlantic to see the benefits, in terms of wealth creation, of dynamic listed companies.