Dimon said a danger of hedge funds and elite traders borrowing off-the-books debt, often through special purpose vehicles (SPVs) or other securitizations. The JPMorgan chief emphasized that the economy may be just one bad trade away from a tidal wave of panic selling, according to CNBC. (RELATED: Debtor Nation: More Americans Going Into Debt Just To Buy Food)“Margin debt is the highest it has ever been,” Dimon said. JPMorgan Chief Executive Officer Jamie Dimon has warned that leverage across financial markets remained elevated, adding that investors should be mindful that hidden borrowing could amplify market disruptions. Dimon said, “When volatility goes up, clearing houses and banks generally ask for more collateral.”