Energy & inflation
Iran war, oil, and the deflation question
Eight months into the war, what the oil shock is doing to prices, and whether history supports the calls for deflation.
The current read
Analysis
Oil is the pressure and credit is the hinge. Physical Brent trades far above futures because the shortage is in prompt barrels and refined products, which is why diesel sits near its high; the official EIA path still has Brent falling toward the $80s by mid-2027. Every oil shock in the historical table ended in disinflation, four of five with a recession, and only one in deflation: 2008, when the oil spike sat on top of a credit collapse. Credit is calm today, so of the three paths in the analysis, deflation is the least supported. Whether the war premium comes out after the midterms or the grind continues into December is still open.
Key takeaways
- Oil shocks in the record end in disinflation; deflation came only in 2008, when a credit collapse arrived at the same time.
- Credit is calm today, so the deflation route is the least supported of the three paths.
- The hinge is political: the midterms on 11-03, and whether strikes resume after them.
Key readings
More readings (6)
Where things stand
- The war is in month 8. It began 2026-02-28. An April ceasefire and a June memorandum both broke down; the US naval blockade has been back since 07-14. No ceasefire is in force. SECONDARY, dated timelines.
- Hormuz is mostly shut to normal traffic, and the data conflict. IMF PortWatch counted 4 transits on 10-18 against a pre-war 85 a day. Yet IEA's October report (excerpt only) has Gulf crude exports back to 13.9 mb/d in September, "approaching pre-war levels", via escorted routes and Saudi exports shifted to Yanbu. October has had the most tanker attacks of the war. SECONDARY.
- The Red Sea is contested, not closed. The Houthis have declared a blockade of Saudi-linked shipping at Bab el-Mandeb since 07-20; ships still transit. On 10-27 they claimed an attack on Ras Tanura, and the State Department ordered non-emergency staff out of Saudi Arabia. SECONDARY.
- The midterms are the hinge. The President pledged no strikes before 11-03; the NYT (relayed, not fetched) reported plans to resume them after. Iran says the strait could reopen within days if its conditions are met. SECONDARY.
- Spot runs far above futures. On 10-13 FRED's physical Brent spot was $125.78 while Brent futures closed at $105.69. The physical shortage is in refined products and prompt barrels, which is why diesel sits near its high.
- The buffers are thin. IEA put effective OPEC+ spare capacity at 320 kb/d in March, the lowest on record (no current figure found). The SPR has given up 133 mb and is 30 mb above the level where routine draws hit legal limits. OPEC+ meets 11-01.
- The official path is down. EIA's October STEO has Brent at $105 in Q4, $87 by Q2 2027 and $74 by Q4 2027, assuming most Gulf output returns by mid-2027.
What history says about oil shocks and deflation
The lesson: every oil shock in the table ended in disinflation, four of five in recession, and only one in deflation. Deflation came in 2008 because the oil spike sat on top of a credit collapse: oil fell 79% and the banking system broke at the same time. Core inflation never went negative in any episode. In the two most recent shocks, stocks bottomed 7 to 8 months after oil peaked.
Supporting data: five oil shocks and 2026, compared
| Episode | Oil rise | CPI peak | Recession | S&P 500 fall | Inflation afterwards |
|---|---|---|---|---|---|
| 1973–74 embargo | +135% | 12.3% | Yes | −48.2% | Slowed to 4.9%; never negative |
| 1979–80 Iran revolution | +166% | 14.8% | Yes, twice | −17.1%, then −27.1% | Slowed; never negative |
| 1990 Gulf War | +166% | 6.3% | Yes | −19.9% | Slowed; never negative. Stocks bottomed the day oil peaked. |
| 2008 | +188%, then −79% | 5.6% | Yes (began before the oil peak) | −56.8% | Headline went negative: −2.1% in July 2009. Core stayed positive. |
| 2022 Russia–Ukraine | +34% (from the day before) | 9.1% | No | −25.4% | Slowed to 2.3%; never negative |
| 2026 so far | +94% to the April high | 4.25% (May) | None yet (NBER indicator 0 through Sept) | −9.1% (to 03-30), since recovered | 3.7% headline, 2.6% core |
Three paths from here (analysis, not forecast)
A. A deal after the midterms
The war premium comes out and oil follows the EIA path toward the $80s. Because energy is up 20% year on year, headline CPI falls fast once prices stop rising, and core is already 2.6%. The Fed stops hiking, long yields ease, and both stocks and long bonds can rise together. This is disinflation, not deflation: nothing in it breaks credit.
What would confirm it: a ceasefire announcement; Hormuz transits climbing toward the pre-war 85 a day; Brent futures below $95; diesel falling week after week; the 12-09 Fed decision dropping its hiking bias.
B. The grind continues
Brent stays near $100–120, CPI stays in the high 3s, the Fed hikes again in December and the 10-year sits near 5–5.3%. This is the regime where stocks and long bonds fall together, as in 2022: short T-bills are the shelter, long Treasuries are not. Equity damage concentrates in rate-sensitive and long-duration growth names, as the Nasdaq-100's larger drawdown already shows.
What would confirm it: no ceasefire into December; October CPI (11-10) at or above 3.7%; a December hike.
C. Escalation, then the 2008 route
Strikes resume after 11-03, Gulf energy infrastructure is hit (Ras Tanura has been struck twice this year), and the SPR nears its legal floor with spare capacity near zero. Oil retests or passes the April high, demand breaks, and recession follows in 2027. Only then does the deflation case open: if a recession and a credit event arrive together, oil can collapse from a high level and headline CPI can turn negative about a year later, as in 2009. Even then, history says core inflation stays positive.
What would confirm it: resumed strikes; a new Brent high above $138; junk-bond spreads above 5% and rising; the S&P 500 down 20% from its high; the Chicago Fed financial-conditions index above zero.
On the deflation forecasts: a deflation call is a bet on path C, and specifically on its second stage, a credit collapse. Credit is calm today: the junk-bond spread gauge in the Signals table reads calm, and the spread sits below both its March war-scare peak and its late-2023 level. A 2008-style credit event means spreads several times today's level. Until spreads move, deflation is the least supported of the three paths.
How markets have reacted to events this year
The pattern so far: the market has sold the escalation and bought the first sign of de-escalation, and the turn in stocks came within days of the turn in oil, as in 1990.
Supporting data: oil, stocks and the fear gauge at each turn
| Event | Oil | Stocks | Fear gauge |
|---|---|---|---|
| War begins (02-28) to the March low (03-30) | Brent $71 → $127 by 03-31 | S&P −9.1%, Nasdaq-100 −11.8% from January highs | VIX 31.05 on 03-27, the year's high |
| April ceasefire (04-07) | Brent peaked that day, $138.21 | Rally from the 03-30 low; new highs by October | VIX fell to 14.21 by 09-22 |
| October tanker attacks and Fed hike aftermath | Spot $115–136, futures near $105 | S&P −1.8%, Nasdaq-100 −6.25% from 10-06 highs | VIX 18.39 (10-26) |
Dates to watch, as listed on 10-27
- 11-01 OPEC+ meeting · 11-03 US midterms · 11-05 Q3 productivity · 11-06 October jobs · 11-10 October CPI · 12-09 Fed decision
- Weekly: EIA diesel and gasoline (Mondays), the SPR level (Wednesdays). Monthly: IEA Oil Market Report (Gulf exports, spare capacity).
- Since that list: on 10-28 the Fed left its target range unchanged at 3.75–4% by a 10–2 vote, and both dissenters wanted another quarter-point hike (FOMC statement, PRIMARY). A pause with two votes for a hike is not yet the dropped hiking bias that path A needs, so 12-09 is the next test (analysis).
What would change this view
- Toward a deal (path A): a ceasefire announcement; Hormuz transits climbing toward the pre-war 85 a day; Brent futures below $95; diesel falling week after week; the 12-09 Fed decision dropping its hiking bias.
- Toward the grind (path B): no ceasefire into December; October CPI (11-10) at or above 3.7%; a December hike.
- Toward escalation and the 2008 route (path C): resumed strikes; a new Brent high above $138; junk-bond spreads above 5% and rising; the S&P 500 down 20% from its high; the Chicago Fed financial-conditions index above zero.
Sources and method
Data marked PRIMARY comes from the publisher (FRED/EIA, BLS, the Fed, IEA, OPEC). SECONDARY means news or an aggregator. The scenarios are analysis, labelled as such. Each table names its own sources beneath it.