"Black Swan" hedge fund Universa Investments expects lower returns from risk capital including equity markets over the next few years due to frothy valuations.

Mark Spitznagel, chief investment officer at Universa, which manages $11 billion in assets and has Nassim Nicholas Taleb as its distinguished scientific advisor, didn't comment on the magnitude of the fall he expected.

But the risk-mitigation specialist said a "shocking percentage" of the rise in markets since 2008 "has been entirely artificial."

Markets could still "rip up" from current levels, but much of those gains won't likely be retained, Spitznagel told the Reuters Global Markets Forum (GMF).

Low subsequent returns that follow high-valuation periods "come from markets with massive swings that just don't make any progress. It doesn't come from markets that just sort of die," he said.

Nearer term, Brett Ewing, chief market strategist at First Franklin Financial Services, expected 2022 to be an unspectacular year for stocks.

Ewing expected the best investment opportunities to be in the S&P 400 .SP400 and S&P 600 .SP600 indexes.

"Forward price-earnings ratios on these indexes (S&P 400 and S&P 600) are vastly lower than that of the S&P 500, which is very rare," Ewing said.

Spitznagel, who recently authored "Safe Haven: Investing for Financial Storms," believes China's consistent intervention in its economy would not end well, but it paled in comparison with the distortions sparked by the U.S. Federal Reserve.

The Fed is "truly driving the ship into the iceberg ... (and) is the greatest driver of the fragilities today."

The U.S. central bank's pivot to accelerate taper of bond purchases while unveiling more aggressive rate hike projections on Wednesday has investors wondering when the Fed would start to shrink its massive balance sheet. urn:newsml:reuters.com:*:nL1N2T03A9

"I do not believe the Fed can never truly tighten again," Spitznagel said. "We've just come too far in the forest ... (it's) too much of a tinderbox now."

(Reporting by Aaron Saldanha in Bengaluru and Divya Chowdhury in Mumbai; editing by David Evans) ((Aaron.Saldanha@thomsonreuters.com; +91 9810644993; Refinitiv Messenger: Aaron.Saldanha@thomsonreuters.com@reuters.net; https://twitter.com/divyachowdhury))