The war in Iran has thrown investors another curveball.

At a time when market-watchers are already fretting over AI pressure on the software sector and a weakening labor market, a war breaking out in the Middle East is now upending markets.

Stocks have been volatile in each of the three sessions since the U.S. and Israel attacked Iran, with the S&P 500 (^GSPC +0.12%) tumbling on Tuesday before recouping much of those losses on Wednesday.

Oil prices have soared, and defense stocks have gained as well. However, at least one prominent investor believes the best move right now is to do nothing.

Steve Eisman, who gained fame as one of the investors in “The Big Short,” said in an interview on CNBC that investors should ignore the war, and he…