Howard Marks says rock-bottom rates are history, bitcoin has its uses, and AI won't replace the best investors. Here are his 8 best quotes from a new interview.

• Howard Marks says interest rates won't return to zero anytime soon.
• The billionaire investor warns the ballooning US federal debt may cause problems in the future.
• Marks says AI won't replace the best investors, and the banking fiasco shone a light on bitcoin.

Interest rates aren't going back to zero anytime soon, and the best investors won't be usurped by artificial intelligence, Howard Marks says.