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Parker immunity doctrine

Principle in antitrust law in the United States

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Through Supreme Court of the United States

The rationale behind Parker immunity is that Congress, in enacting the Sherman Act, evidenced no intent to restrain state behavior.

State must act as a sovereign

For the doctrine to apply, the state must act as a sovereign, rather than as a "participant in a private agreement or combination by others for restraint of trade. Antitrust laws do not bar anticompetitive restraints that sovereign states impose "as an act of government". "The key question is whether the allegedly anticompetitive restraint may be considered the product of sovereign state action. If it is not, then even if sectors of state government are involved, the activity will not constitute "state action" under the Parker doctrine and will not receive immunity."

Moreover, the Parker court found that "a state does not give immunity to those who violate the Sherman Act by authorizing them to violate it, or by declaring that their action is lawful." Instead, the anticompetitive conduct "must be compelled by direction of the State acting as a sovereign," not merely prompted by state action, to be immunized under the state action doctrine.

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