Tesla CEO Elon Musk and his brother, Kimbal Musk, are reportedly under investigation by the Securities & Exchange Commission. The Wall Street Journal, citing unnamed people familiar with the probe, said the investor watchdog agency is looking into sales of Tesla (TSLA) shares by Kimbal, a member of the Tesla board, just before his brother, Elon, announced on Twitter that he would sell 10% of his own Tesla holdings, a move that sent Tesla shares sharply lower in the days that followed. What type of market failure does this potential case highlight and why?