Markets analyst says US tech investors 'worried' about how tech firms are making their money

The world's biggest music streaming service Spotify has started trading on the New York Stock Exchange at a valuation of almost £21 billion, but market analyst Scott Shellady tells Sky's Ian King American tech investors are beginning to worry how tech companies can make money.


(Source: Sky News, https://www.youtube.com/watch?v=KcDnSo3UslQ)