Nobel economist Paul Krugman says the Iran war could be the 'straw that breaks the camel's back' for a fragile US economy

STR/NurPhoto via Getty Images

• The US-Iran war has sparked major volatility in financial markets.
• Economist Paul Krugman thinks the war could have significant consequences for the US economy.
• "We've added a fresh level of massive uncertainty," Krugman said.

The Iran war upended markets this week, and economist Paul Krugman thinks the effects could ultimately be much more far-reaching.

The Nobel Prize winner hasn't been too optimistic about the US economy recently...