'It's not healthy to have people buying stocks for fun': Billionaire investor Howard Marks warns the day-trading boom reminds him of the dot-com bubble

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· *Billionaire investor Howard Marks took aim at rash day traders in a CNBC interview on Tuesday.*
· *"It's not healthy to have people who are buying stocks for fun," the Oaktree Capital chief said.*
· *Marks also flagged similarities between the current speculative frenzy and the dot-com bubble.*
· *"It reminds me...