Exxon Corp. v. Governor of Maryland

Maryland enacted the law in response to evidence that integrated producers and refiners had favored company-operated stations during a gasoline shortage and that this practice could weaken competition among retail stations. Regulating practices thought harmful to a State's internal commercial affairs is a legitimate legislative objective.

The refiners offered evidence that company-operated stations benefited consumers and argued that forced divestiture would frustrate competition. But that argument challenged the economic wisdom of the legislation rather than its constitutional rationality. Under modern substantive-due-process review, courts do not sit as superlegislatures to choose between competing economic policies.

Even if the statute ultimately proved economically unwise, it bore a reasonable relation to Maryland's purpose of controlling perceived inequities and preserving competition in gasoline retailing. That rational connection was sufficient under the Due Process Clause.

The statute did not distinguish between in-state and out-of-state petroleum products, favor local producers or refiners, restrict the flow of gasoline into Maryland, or impose special costs on out-of-state goods. Indeed, Maryland had no petroleum producers or refiners, and all gasoline sold in the State came from outside it.

At the retail level, the law did not bar interstate independent dealers from entering Maryland, impose a cost on them, or otherwise grant local retailers an advantage over out-of-state retailers as such. Interstate firms that did not produce or refine petroleum could continue operating retail stations in Maryland.

The fact that a regulation burdens particular interstate companies does not itself establish discrimination against interstate commerce. Unlike laws that alter the relative market share of local and out-of-state goods, Maryland's law did not demonstrably affect the interstate flow of gasoline.

Some refiners might withdraw from Maryland because they could not operate company-owned stations, and consumers might lose services associated with those stations. But there was no reason to conclude that gasoline supplies would not be replaced by other interstate suppliers or sold through independent dealers.

The Commerce Clause protects the interstate market from prohibited or burdensome state regulation; it does not protect a particular interstate firm's preferred business structure, method of retailing, or share of a local market. A shift in business from company-operated stations to independent dealers therefore did not itself burden interstate commerce in the constitutional sense.

The refiners' assertion that the law would weaken independent refiners was ultimately an objection to the statute's economic consequences. That concern could bear on the wisdom of Maryland's policy, but not on the constitutionality of an otherwise evenhanded regulation.

The Court has rarely treated the Commerce Clause, without congressional action, as excluding all state regulation from an entire field. That result is generally reserved for subjects where the lack of national uniformity would itself impede the interstate movement of goods.

The refiners' concern was not principally that varied state rules would create inconsistent obligations. Rather, they feared that many States would adopt the same kind of divestiture rule. That is a policy concern about the cumulative substance of state regulation, not a need for national uniformity.

Absent a congressional declaration displacing state authority, or a showing of discrimination against or a concrete burden on interstate commerce, Maryland retained authority to regulate gasoline retailing within its borders.

The Court did not need to resolve the unsettled question whether the Robinson-Patman Act's good-faith meeting-competition defense could protect every type of voluntary allowance covered by Maryland's law. Even assuming the defense could apply, the State law did not create the type of direct conflict necessary for preemption.

The oil companies' asserted conflicts were speculative. A statewide allowance might sometimes require a seller to give a reduction more broadly than federal law would permit, but the State law did not require discriminatory pricing in violation of the Robinson-Patman Act. Possible hypothetical conflicts were too uncertain to justify invalidating the statute.

Section 2(b) is a limited defense to federal liability for price discrimination, not an affirmative federal right to engage in selective price reductions. Congress's decision to permit a defense in defined circumstances did not show an intent to prohibit States from requiring more uniform treatment of retail customers.

Maryland's policy was also compatible with an important aim of the Robinson-Patman Act: preferring equal treatment of customers over sellers' freedom to make selective competitive concessions. A general federal policy favoring competition cannot, by itself, invalidate every state economic regulation with an arguably anticompetitive effect; otherwise, state authority over economic affairs would be drastically curtailed.