Oil Hit $100, Then Fell $15 in Five Days — and Every Central Bank Is Still Holding the Bag

Brent crude crossed $100 a barrel on July 23 for the first time since May 26, closing at $100.69. Five sessions later it was $84.91, down 3.9% on the day, with West Texas Intermediate at $79.87. Nothing about the monetary policy set in between has been revised. That gap — between a price that moves in hours and a policy framework that moves in quarters — is the defining macro problem of this month.

What actually happened to the price

The spike had specific causes: tanker strikes near Saudi Arabia, threats around the Strait of Hormuz, and an explicit warning from Washington that it would destroy Iranian infrastructure in response to attacks on shipping. Crude rose more than 30% over the month.

The reversal had equally specific causes. The United States paused strikes to allow negotiations, Iran opened discussions on the Strait with Saudi Arabia and Oman, and the White House described talks as going well. Traders concluded the supply disruption might not arrive.

Neither move tells you where oil settles. What both tell you is that the entire price range this month has been a geopolitical risk premium, not a change in barrels produced or consumed.

The same shock, three different problems

United States. The Fed holds at 3.50%–3.75% with inflation described as elevated relative to the 2% target and price pressures becoming more broad based. Roughly 38% odds of a hike are priced for Wednesday’s decision. The hawkish case was built on $100 oil that no longer exists.

Eurozone. The ECB held all three key rates on July 23 — deposit 2.25%, main refinancing 2.40%, marginal lending 2.65% — and left a September hike open. Its own business survey found firms already passing higher energy costs into selling prices. The eurozone imports its energy, so this is a pure cost shock with no domestic offset.

Canada. The Bank of Canada held at 2.25% on July 15, citing improving growth and inflation projected to ease gradually. But Canada is an energy exporter. The same barrel that is a tax on Europe is a terms-of-trade gain here — supporting the energy sector, energy-province employment and the currency, while simultaneously raising prices at the pump.

Three central banks, three genuinely different problems, one input price.

Why supply shocks are the hardest case for monetary policy

A central bank raising rates reduces demand. That is the entire mechanism. It works well when inflation comes from an economy running hot.

It works poorly when inflation comes from a supply constraint. Raising rates does not produce more oil. It reduces demand for everything else in the economy, potentially causing a slowdown while the price of the constrained good stays high anyway.

The textbook answer is to look through supply shocks. The problem with the textbook answer is that it only holds while inflation expectations stay anchored. Once firms pass costs into selling prices — which the ECB survey found is already happening — the shock stops being contained to energy and becomes general inflation. At that point, looking through it is no longer available as an option.

The asymmetry that makes the retreat less helpful than it sounds

Here is the part that gets missed when crude falls: pass-through does not run backwards at the same speed.

Firms raise prices quickly when input costs rise, and lower them slowly, or not at all, when input costs fall. Economists call it rockets and feathers. If European and North American selling prices have already absorbed $100 oil, $85 oil does not automatically unwind them.

So a central bank can find itself in the worst configuration available: tightening into an inflation print caused by a shock that has already reversed in the spot market, while the demand-side damage from tightening arrives on its usual eighteen-month lag.

What it means for Canadian portfolios

Energy exposure is a natural hedge most Canadians already own. Energy is a substantial TSX weight, so a broad Canadian index fund carries built-in offset to fuel-driven inflation. This is one of the rare structural advantages of home-country bias for Canadians — though it is smaller than it used to be now that banks exceed 25% of the index.

Long-duration assets are the pressure point. Utilities, REITs and telecoms trade off the long end of the curve. Persistent energy inflation pushing yields higher hurts these regardless of operating performance, and Canadian investors are typically overweight all three through dividend-focused funds. Check the sector concentration behind your income holdings in the dividend tracker.

Fixed mortgage rates already moved. Canadian fixed mortgage rates track Government of Canada bond yields, not the overnight rate. Borrowing costs rose before any policy change — and they will not fall back as quickly as crude did.

Cash finally pays. Rising yields improve GIC and high-interest savings returns immediately. For anyone with a near-term cash target — a down payment, tuition, an emergency fund — this environment is straightforwardly favourable. The retirement planner will show what a sustained change in the risk-free rate does to a long-horizon plan.

Frequently asked questions

How high did oil go in July 2026?
Brent crossed $100 a barrel on July 23, closing at $100.69 — its first close above $100 since May 26 — before falling to about $84.91 by July 28.

Why did oil fall if the conflict is still going?
Because the price contained a risk premium for a supply disruption that had not yet happened. When the United States paused strikes and Iran opened talks on the Strait of Hormuz, traders priced a lower probability of that disruption.

Is high oil good or bad for Canada?
Both, in different places. It supports energy producers, energy-province employment and the Canadian dollar, while raising costs for households and non-energy businesses.

Will oil stay below $100?
Nobody knows. Geopolitical premiums can unwind quickly and can also return overnight. Building a portfolio around a specific forecast of either outcome is the most common mistake investors make in energy shocks.

Bottom line

The most consequential input into 2026 monetary policy is not any central banker’s forecast. It is a commodity price set by events in a conflict zone — one that moved $15 in five days, in a month when three central banks had to commit to a view. That is why every statement this month has been carefully vague.