Walmart, the company that built an empire on selling everything cheap to everyone, is now warning that its customers may have to start rationing gasoline.

The retailer’s executives have flagged surging petrol prices, driven by the ongoing conflict in Iran, as a serious threat to American consumer behavior. With national gasoline averages climbing toward $4 per gallon and some markets already exceeding $4.50, households are pulling back on discretionary spending in ways that ripple far beyond the fuel pump.

The numbers behind the pain

Gasoline prices have jumped roughly 35% to 50% since early March 2026, a direct consequence of the Iran war disrupting global energy markets.

Walmart executives have observed a clear behavioral pattern. Consumer spending starts to crack when gas hits the $3.50 to $4 per gallon range. Once prices push into the $4.50 to $5 zone, the cuts become serious.

Former Walmart US CEO Bill Simon put it bluntly, warning that prolonged disruptions from elevated fuel costs would create a chilling effect on additional consumer expenditures. Dining out, in particular, is one of the first categories to get axed when families start budgeting around gas prices.

A broader economic slowdown takes shape

Oxford Economics predicts that consumer spending growth in 2026 will slow to its lowest rate since 2013, driven primarily by sustained pressure from fuel costs.

Analysts are watching the $5 per gallon threshold as a potential tipping point. If national averages breach that level, the expectation is a significant contraction in consumer demand across both retail and service sectors.

Walmart is approaching its quarterly earnings report, and financial reports are already showing slower profit growth that correlates with rising fuel expenditures.

What this means for investors

Retailers that depend on discretionary spending, think apparel, electronics, home improvement, face the most immediate risk.

For Walmart specifically, the question is whether its low-cost positioning can offset declining traffic and smaller basket sizes. Grocery and essential goods categories may hold up relatively well, which could benefit Walmart’s core business mix. But the margin-rich discretionary categories that drive profit growth are vulnerable.

The geopolitical dimension adds another layer of uncertainty. The Iran conflict has caused crude oil prices to surge from around $67 per barrel before the conflict to over $100 per barrel, and the disruption shows no signs of resolving quickly, meaning the pressure on consumers could persist well beyond a single quarter.