Uber workers told to ignore 'pessimistic voices' as shares slide

CEO defiant in email but downward spiral continues after stock market debut

The chief executive of Uber has urged employees to ignore "pessimistic voices" after shares in the company slumped again on their second day of trading since Friday's disappointing stock market debut.

With Wall Street in a fragile state after the re-emergence of trade tension between the US and China, Uber's stock market value fell below $63bn (49bn), just over half the $120bn that its investment bankers advised it could be worth last year.