Shares in electric vehicle maker Tesla sank to a new 52-week low on Tuesday, closing around $138 per share, or 8% lower for the day in an otherwise mixed day for stocks. CEO Elon Musk tried to blame the sinking price partly on macroeconomic factors. Long-time Tesla bull Ross Gerber wrote in a tweet, “Tesla stock price now reflects the value of having no CEO. Great job tesla BOD — Time for a shake up. $tsla.” Gerber has launched an informal campaign to have fellow shareholders vote to appoint him to Tesla’s board of directors. Musk replied, in a tweet,...