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Antitrust or Competition Review

Standing review — instantiates Bounded Rivalry Governance

A standing authority that checks whether winning a contest has hardened into durable power over the arena itself, and imposes structural remedies when it has.

Antitrust or Competition Review is the external, standing authority that asks the one question no contestant will ask on its own: has winning this arena granted power over the arena itself? It reviews whether a victory — a merger, a runaway share, control of the only remaining rival — has produced durable advantage unrelated to the contest's purpose, and it can impose structural remedies to reopen what has closed. Its defining move is that it sits outside and above the rivalry, judging the future contestability of the field rather than any single match, and it holds certain domains off-limits so no winner can capture them.

Example

Two large grocery chains — the only two rivals across a cluster of towns — propose to merge. Combined, they would hold roughly 60% of stores in several regions, and in the overlap towns they are literally the only competitors: the merger would end the rivalry rather than win it. A competition authority reviews not who "won" but what the win does to the field. Shoppers in those towns would be left without an alternative, and local suppliers with a single buyer.

The authority clears the merger nationally but requires divestiture of stores in the overlap towns and mandates continued shared access to a regional distribution hub that a new entrant would need to compete — an essential facility declared non-capturable.[1] The remedy targets the durable power, not the fact of winning: a firm may win fairly and still be made to give back what its victory would have permanently closed.

How it works

What distinguishes this mechanism is that it can override a contest's outcome in the name of keeping future contests possible:

  • Assess the power, not the merit — measure share, foreclosure, and lock-in, and distinguish advantage that was earned from advantage that entrenches.
  • Tie the concern to purpose — ask whether the durable power relates to the contest's aim (better product) or is unrelated capture (owning the only channel).
  • Apply the remedy toolkit — block, unwind, divest, or mandate access, reserving structural separation for when the power will not otherwise loosen.
  • Protect a non-contestable floor — declare essential facilities and interoperability points off-limits, so the field a rival needs stays open.

Tuning parameters

  • Intervention threshold — how much dominance triggers review; a low bar protects contestability but chills winning, a high bar lets lock-in set before anyone acts.
  • Remedy strength — behavioral conduct rules versus structural divestiture; structural is durable but blunt and hard to reverse.
  • Ex ante vs. ex post — pre-clearing a merger versus unwinding dominance later; earlier is cleaner but must guess at effects.
  • Scope of the protected floor — how much is declared non-contestable (which facilities, which interfaces).
  • Burden of proof — on the incumbent to show the win is benign, or on the authority to show harm.

When it helps, and when it misleads

Its strength is unique: it is the only mechanism that defends the game from its own winners, stopping a contest from producing a victor who then rewrites the rules for everyone after. Its failure mode is that judging counterfactual market power is genuinely hard and slow — by the time lock-in is proven it may be entrenched, and an over-aggressive review punishes success and deters the very effort the rivalry was meant to elicit. The classic misuse is wielding it selectively as a political weapon: hobbling a disfavored firm, or shielding a favored incumbent from a superior challenger. The discipline that keeps it honest is to tie intervention to explicit, purpose-linked harm — foreclosed entry, captive customers, a closed essential facility — rather than to size alone.

How it implements the components

This review fills the arena-defense side of the archetype, and only that:

  • winner_power_and_lock_in_review — its core act: judging whether a win became durable, purpose-unrelated power over the field.
  • protected_floor_or_noncontestable_domain — it declares essential facilities and interoperability points off-limits to capture, a floor no winner may enclose.

It diagnoses lock-in but does not itself reopen entry with a scheduled opening — that is Challenger Access Window; it does not detect the collusion among rivals that softens a field — that is Anti-Collusion Monitoring; and it does not price the external harms a contest exports — that is Externality Bond or Liability Rule.

Notes

The review judges structure, not conduct: a firm can compete cleanly and win fairly and still trigger a remedy, because the concern is the field's future contestability rather than any wrongdoing by the winner. This is what separates it from a foul penalty — it can act where no rule was broken but the rivalry would otherwise die.

References

[1] The essential facilities doctrine — that control of an input rivals cannot practicably replicate can require the holder to grant access — is the competition-law basis for declaring certain facilities a non-contestable floor. It is named here as a real remedy type, not as evidence of any specific case outcome. ↩