Billions of dollars were wiped off the value of Tesla stock after the company’s chief executive, Elon Musk, ignored questions from two analysts during the recent earnings conference call. Photograph: VCG/VCG via Getty Images

Tesla chief executive Elon Musk has long been lauded as a visionary, but investors in the electric car maker have endured a torrid time lately, with m(...)

Former Enron chairman Kenneth Lay: short-sellers tend to get a bad press but their defenders point to their exposure of questionable practices at companies like Enron. Photograph: Dave Einsel/Getty Images

Short-sellers profit from market declines, something that has long ensured their unpopularity with politicians, regulators and chief executives. Napol(...)