The dormant Commerce Clause limits states when they regulate commerce. But states also act like businesses: they buy supplies, sell products and run facilities. When a state acts as a market participant rather than a regulator, it may prefer its own residents, just as a private company may choose its customers.
Why it works
Key idea
Worked example: Downstream limits: South-Central Timber (1984)
- Selling timber is market participation; Alaska may set the price and choose buyers.
- But requiring processing in Alaska reaches the next market, timber processing, in which Alaska is not a participant.
- A private seller could not control what buyers do after the sale in this way; this is regulation dressed as a contract.
Answer: Not protected. The condition regulated a downstream market and violated the dormant Commerce Clause.
Worked example: Public versus private: United Haulers (2007)
- The law favored a public facility doing a traditional government job, not local private businesses over out-of-state ones.
- Treating every favor to a government entity as discrimination would let courts second-guess ordinary public services.
- So the law was not "discriminatory" under the near-per-se rule; under Pike, its burdens did not clearly exceed its benefits.
Answer: Upheld. Favoring a public entity is treated differently from favoring local private businesses. Justice Thomas, concurring, argued the dormant Commerce Clause should be abandoned altogether.
Common mistake
Note that the market participant exception applies only to the dormant Commerce Clause. Discrimination against out-of-state citizens may still be challenged under Article IV's Privileges and Immunities Clause, which has no market participant exception.