The two levers under the cap

What holds a fuel cap in place is the pair of levers behind it rather than the label at the pump: a voluntary agreement joined by companies representing 96% of service stations, and the government's power to reduce the IEPS excise tax on fuel temporarily. In Mexico that arrangement keeps Magna petrol below 24 pesos a litre and diesel at 27 pesos. Energy Minister Luz Elena González Escobar has raised the second lever before.[1]

An administered price works not by suppressing demand, as the orthodox account suggests, but by redirecting the flow of revenue between the fuel chain and the treasury. The tax not collected per litre is the counterpart of the difference the household does not pay. Before it is a subsidy argument it is an accounting identity: one side's expense is the other side's forgone revenue.[1]

Which balance sheet accumulates the burden

As the international price rises, so does the size of the forgone tax; the cost of the cap is therefore not fixed but a variable tied to the crude price. President Claudia Sheinbaum argues that household budgets are being protected in Mexico while fuel prices rise elsewhere. Even if that defence holds, where the protection accumulates is a separate question.[1]

An alternative reading is available: because Mexico is an oil producer, a high crude price can feed public revenue through another channel and partly offset the forgone tax. In that case the net cost of the cap is smaller than it appears. The information at hand does not establish which channel dominates. Nobody holds the odds here; the question sits in the territory of fundamental uncertainty rather than of calculable risk.[1]

Two forms of the same support

The same resources could have been distributed as a direct income supplement. The difference between the two forms lies in who receives how much rather than in the accounting: forgone IEPS excise tax collection goes largely to households that consume a lot of fuel and only slightly to those that consume little. If collection keeps falling while the crude price stays high, the scale of that uneven distribution grows with it. That is where the appeal of an administered price lies: its cost stays out of consumer inflation and sits inside the fiscal accounts.[1]