The war with Iran, for all its complexity and global effects, boils down to a single question: Who can take the pain the longest?

A surge in oil prices points to what may be Iran’s most effective weapon and the United States’ biggest vulnerability in continuing the campaign: Damaging the world economy. A sharp rise in gas prices has rattled consumers and financial markets, and international travel and shipping have been severely disrupted.

U.S. President Donald Trump appears aware of the danger. As oil jumped to nearly $120 a barrel on Monday, the highest since 2022, he suggested the war would be “short-term.” That helped reassure markets and the price eased to around $90 — even as Trump, nearly in the same breath, vowed to keep up the war and the punishment on Iran.

On the other side, Iran has to endure a near-constant stream of American and Israeli airstrikes it can’t defend against. So far, the Islamic Republic has been able to keep its leadership and military cohesive and in control. The Iranian public, which already rose up against its theocracy in nationwide protests in January, still boils in anger but have stayed home as they try to survive the heavy bombardment. Security forces have been on the street every day to ensure no anti-government demonstrations form.