The United States' bunker-busting entry into Israel's war with Iran is having only a modest effect on the price of oil and stock markets worldwide Monday, at least for now. The hope is that Iran won't retaliate in a way that disrupts the global flow of crude, which would hurt economies worldwide but also its own.

The S&P 500 was edging down by 0.1% in early trading, coming off a week where stock prices had jumped up and down on worries about the conflict potentially escalating. The Dow Jones Industrial Average was down 37 points, or 0.1%, as of 9:35 a.m. Eastern time, and the Nasdaq composite was 0.4% lower.