shares of electric car maker tesla slumped 6.5% on the first day of its addition to the benchmark s&p 500 index. the firm became the most valuable company ever added to the s&p 500, accounting for nearly 1.7% of the index but the decline of its shares is worrying investors concerned about the volatility of the stock. financial markets had a bit of a rough ride on monday, largely caused by uncertainty over the new variant coronavirus spreading through the uk. so, what can we expect when european and us markets open later today? joining me now is fiona cincotta from city index. fiona, welcome to you. take us first of all through the european markets which were really choppy yesterday. what can we look forward to today? that's right. we had a really tough session yesterday stop