Mark Spitznagel
Mark Spitznagel.
  • Mark Spitznagel flagged a huge credit bubble, slammed the Fed, and endorsed Warren Buffett's advice.
  • The Universa Investments boss warned stocks and debt levels are too high and will end in disaster.
  • Retail investors should buy an index fund, not dump stocks for gold or trade options, he said.

The boss of a "Black Swan" fund has raised the alarm on dangerous amounts of debt, slammed the Federal Reserve for putting financial markets and the US economy at risk, and advised retail investors to protect themselves by following Warren Buffett's simple advice.