Amid the market volatility sparked by Donald Trump's on-off tariff plans, during which the benchmark S&P 500 index fell by 3.1% last week and the Nasdaq entered 'correction' territory, no stock has been more badly hit than Tesla.Shares of Elon Musk's electric vehicle maker have fallen for seven straight weeks, the longest losing streak since the company floated on the stock market 15 years ago, wiping out more or less all of the gains it enjoyed after Mr Trump was elected president in November last year. Mo ...