Pricing Algorithm Cartels: How Amazon’s ‘Project Nessie’ and German Gas Stations Reveal a Hidden Competition Threat

Pricing Algorithm Collusion: The Ghost Cartel Phenomenon

A recent antitrust filing alleges that Amazon’s internal “Project Nessie” pricing algorithm silently halted competition, generating over ↑ $1 billion in excess profit. The FTC says the tool raised prices only after rivals matched, then paused during regulatory scrutiny before reactivating. Amazon denies the claim, insisting the system was retired years ago. In a parallel study, German fuel stations that simultaneously adopted a pricing algorithm in 2017 saw margins swell ↑ 38%, while solitary adopters experienced no shift, highlighting a pattern where independent AI agents converge on higher prices without any explicit pact.

“Algorithmic price‑setting can produce cartel‑like outcomes without any explicit agreement,” said an FTC spokesperson.

The phenomenon, dubbed the “ghost cartel,” differs from coordinated hubs like RealPage, whose rent‑setting software pooled competitor data and faced a high‑profile DOJ settlement (Reuters, Bloomberg). Courts have struggled to apply traditional antitrust frameworks to AI‑driven tacit collusion, as illustrated by divergent rulings in the Ninth and Third Circuits over hotel pricing tools. Companies must now audit not just financial outcomes but the behavioral logic of their pricing agents. Leaders should map observable competitor signals, impose constraints that disrupt sustained coordination, and conduct counterfactual competition tests that strip away rival price inputs to verify genuine margin creation. Documenting the algorithm’s objective, permissible data sources, and any policy changes creates an auditable mandate that can shield firms from reputational and regulatory fallout. The stakes are high: without vigilant governance, autonomous pricing can transform a competitive market into a silent cartel, eroding consumer welfare while inflating corporate profits.

Reported by Leo Carmichael (Special Assignments Reporter).
(Note: Leo Carmichael is covering this desk while Arthur Sterling is recovering from the flu.)