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The Federal Trade Commission has alleged that Amazon employs non-transparent reserve-price mechanisms within its advertising auction system to artificially elevate advertiser expenditures—a charge Amazon has disputed. The allegation centers on whether Amazon uses its platform's informational asymmetry and gatekeeper position to set opaque reserve thresholds that constrain competition and extract economic rents from advertisers without corresponding disclosure or justification.
The regulatory pressure is reinforced by recent judicial precedent: courts have sided with the FTC in antitrust challenges against Google's ad-tech infrastructure, establishing heightened scrutiny of how dominant platforms structure their auction mechanics. These rulings suggest courts are increasingly skeptical of opaque or algorithmically-determined floor pricing in advertising exchanges, particularly when such mechanisms may disadvantage smaller competitors or lack transparent methodology. Amazon's defense now faces headwinds from jurisprudence that no longer accepts "competitive markets" as a blanket defense without granular proof of non-discriminatory pricing and clear algorithmic rationale.