Oil sat below $100 a barrel on Thursday even as missiles flew across the Persian Gulf. That gap, between the shooting and the price, tells you most of what you need to know about how markets are reading this war. Traders aren't panicking. They are settling in.

The latest round began after U.S. Central Command reported it had finished a series of strikes on Iranian military sites, and Tehran answered by hitting targets in Gulf states. Crude rose roughly 2% on the day, U.S. stock futures edged higher, and Asian markets mostly slid. None of it amounted to the kind of disorderly repricing you would expect if investors thought a genuine supply shock was imminent. According to CNBC's reporting, the calm rests on a simple calculation: there is still enough slack in the system to absorb the disruption.

Why the oil price isn't blowing up

The Strait of Hormuz, through which a fifth of the world's traded oil normally moves, is again a flashpoint, and shipping there has been disrupted. Yet the price hasn't broken through the psychological ceiling of $100, because the market has more cushions than it did a decade ago. Alternative export routes have taken on more volume. U.S. energy exports have climbed. Strategic reserve releases stand ready to plug short-term gaps. The buffers are real, and traders know it.

That does not mean the all-clear. It means the fear has changed shape. Rather than a single violent spike followed by a return to normal, the more plausible scenario now is a slow, grinding elevation of costs that simply doesn't go away. Energy stays expensive. Borrowing stays expensive. The two reinforce each other, and the squeeze becomes structural rather than episodic.

There is a forecast worth keeping in view. Analysts at Rystad have floated the idea that today's oil deficit could flip into a large surplus by 2027, which, if it holds, would eventually pull prices back down regardless of the fighting. The timing of that relief, though, is exactly the kind of thing a war can push around.

From ceasefire to 'long grind'

The phrase doing the rounds among strategists is "long grind," and it captures a genuine shift in positioning. A few weeks ago, markets were betting on mediation, on some negotiated pause that would let everyone exhale. That bet has unwound. With each new exchange of fire, a diplomatic off-ramp looks further away, and prices have adjusted accordingly.

Billy Leung, an investment strategist at Global X ETFs, argued that the popular "forever war" framing misses the point. Wars, he noted, rarely actually run forever. Risk premiums, on the other hand, can persist long after the front pages have moved on. "Wars rarely run forever, but risk premiums can," he told CNBC. That distinction matters more than it might sound. It is the difference between a temporary inflation scare and a permanent re-rating of how much investors charge to hold risk in an unstable world.

Leung's read is that the market has stopped treating the conflict as a passing shock and started treating elevated geopolitical uncertainty as a baseline condition. In his telling, the easy years are over: the stretch when buying almost any asset was rewarded, when cheap money lifted everything together. A protracted war ends that, he suggested, because rising energy costs and a higher real cost of capital lift the bar that corporate earnings have to clear. Companies have to work harder just to stand still, which is a more sobering message than any single-day move in crude.

The status-quo case

Not everyone is rewriting their playbook. Benjamin Jones, who runs global research at Invesco, said the firm's base case is still a status quo of intermittent strikes rather than a full-blown war. By that reading, equities have behaved exactly as the textbook says they should during a geopolitical scare: a sharp sell-off, then a recovery. Jones drew the conventional lesson from that pattern, telling CNBC that holding through the turbulence usually beats trying to time an exit.

It is a defensible position, and history is mostly on his side. Markets have a long record of overreacting to the opening salvos of a conflict and then clawing back the losses once the worst-case scenarios fail to arrive. The Gulf War, the 2003 invasion of Iraq, various Israeli-Iranian shadow exchanges: in each case the equity sell-off proved shorter-lived than the headlines implied.

Still, the two views aren't as far apart as they first appear. Jones is making a tactical point about whether to sell stocks today. Leung is making a structural point about what kind of returns to expect over the next several years. You can believe both that staying invested beats panic-selling and that the underlying cost of capital has shifted permanently higher. The awkward part is that the second belief eats slowly into the first.

What the ratings agencies are saying

The most concrete institutional signal this week came from Fitch Ratings, which cut its outlook on the global sovereign sector to deteriorating from neutral and pinned the move squarely on the U.S.-Iran war. Fitch expects the conflict to drag on global growth, push inflation and bond yields up, and raise geopolitical risk across the board. When a major agency moves an entire sector's outlook on a single geopolitical event, that is not noise. It is a marker that the war is now baked into the cost of government borrowing, not just oil and equities.

The stalemate itself may be the most durable feature of the whole situation. Andy Lipow of Lipow Oil Associates told CNBC that both Washington and Tehran appear convinced that time favors them, and that neither is inclined to offer concessions that would breach the other's red lines. His blunt assessment was that the standoff could grind on regardless of how many bombs fall. If both sides genuinely believe waiting works in their favor, there is little internal logic pushing either toward the table. That is the recipe for exactly the kind of extended, low-grade conflict the markets are now pricing.

What to watch

The near-term tell is Hormuz. As long as oil stays under $100 and the disruptions remain manageable, the long-grind thesis holds and equity markets can keep doing their sell-off-and-recover dance. A genuine closure of the strait, or a strike that takes out meaningful export capacity, would break that calm fast and force a harder repricing.

The longer-term question is the one Leung raised: whether the geopolitical risk premium becomes a permanent fixture of the cost of capital. If it does, the consequences land far from the Gulf. Higher hurdles for corporate earnings. Pricier government debt. A world in which the cheap-money era really is over, and investors spend the next few years adjusting to a tax on risk that doesn't lift even when the fighting eventually stops. The headlines will fade. The premium may not.