• Nouriel Roubini and Michael Novogratz sparred over bitcoin and cryptocurrencies in a debate Wednesday at the SALT 2019 conference in Las Vegas.
  • Roubini repeated his belief the crypto is a bubble, while Novogratz said the bitcoin price rebound is proof that it has a future.

Two prominent market voices squared off Wednesday over the future of cryptocurrencies in a debate that ended with a bet over a T-shirt.

Economist Nouriel Roubini, who for many years wore the sobriquet "Dr. Doom," said bitcoin and its peers don't even deserve to be called "cryptocurrencies." Investor and former hedge fund manager Michael Novogratz said Roubini is underestimating the sector's future, and challenged him to put his pride where his mouth is.