Bubbles in AI and credit are beginning to burst, according to David Roche. The ex-Morgan Stanley research chief said he believed the bubbles could inflict "serious" damage to the economy. His own wealth-protection portfolio includes plays like gold, real assets, and defense stocks. A scenario that investors have been worried about all year might be unfolding. David Roche, a strategist at Quantum Strategy and the former head of research at Morgan Stanley, said he believes two bubbles in the market m ...