Written by attorneys · grounded in primary & secondary sources — see below
A governmental entity engaging in commercial transactions as a buyer or seller rather than imposing regulatory requirements on private parties. The entity may favor its own residents in the immediate transaction without violating the Dormant Commerce Clause.
Sources & Authorities
How it applies
Common Examples
2
State Scrap Purchase Program
The State of Virginia operates a program buying scrap metal from local dealers. It pays Mercury Industries, a Virginia company, above-market rates while offering lower prices to Monarch Pharmaceuticals, an out-of-state buyer. Mercury Industries receives the premium payments without challenge under the Dormant Commerce Clause because Virginia is participating in the market as a purchaser.
Timber Sale With Processing Condition
The State of Alaska sells state-owned timber to Midwest Airlines at a favorable price. The contract requires Midwest Airlines to mill the timber inside Alaska before any out-of-state shipment. Midwest Airlines challenges the condition after title passes. The requirement is invalid because it regulates downstream commercial activity beyond the initial sale.
Put it into practice
Test Yourself
10
Practice Questions5
· 3 primary sources
Select any source to read its text and confirm it supports the definition.
Cases
Hornbooks
Common questions
Frequently Asked
3
When may a state favor its own residents under the market participant doctrine?+
A state may favor its residents when it acts as a buyer or seller in the market rather than as a regulator. The doctrine permits differential pricing or terms in the immediate transaction, such as paying higher rates to in-state suppliers.
Supporting sources
Does the market participant doctrine permit downstream conditions on purchasers?+
No. A state may not impose conditions that control how buyers use goods after the sale in a manner that discriminates against interstate commerce. Such requirements extend beyond the immediate transaction and violate the Dormant Commerce Clause.
Supporting sources
How does the market participant doctrine apply to state construction projects?+
A city or state funding its own projects may require contractors to hire a percentage of local residents. The preference is valid because the government is participating in the market as a purchaser of services.
Supporting sources
Business Associations Agency and PartnershipFiduciary duties between principal and agent · Duty of loyaltyUBEFoundational