NEW YORK — Stock markets rallied worldwide, and oil prices eased after the United States and Iran reached a tentative deal to get the global flow of crude going again.

The Standard & Poor’s 500 rose 1.7% Monday on hopes that this time, the announcement of an Iran-U.S. agreement will mean a long-term fix to a conflict that has worsened inflation around the world.

The Dow Jones Industrial Average climbed 0.9%, and the Nasdaq composite jumped 3.1%.

Stocks got a lift after the price for a barrel of Brent crude oil fell 4.8% to $83.17, back to where it was in early March. While that’s still above its price of roughly $70 from before the war, it’s lower than the $100 plus it cost just a few weeks ago. The hope is that lower oil…