PosoKanei · Greek supermarket price comparison

Price-Coordination Screen

Statistical screening for cartel-like pricing · generated 2026-06-20

Competitive (low concern)
Healthy price dispersion market-wide; check flagged pairs.
327
products fully identical
5.5% of multi-retailer
8.1%
median price dispersion
low = suspicious
1
suspicious retailer pairs
189 pairs evaluated
5931
products compared
sold by 2+ retailers
1Price identity & parallelism

How often rivals selling the same product post the very same price.

2Cross-retailer dispersion

Spread of prices across retailers per product. Healthy competition shows dispersion; a cartel compresses it (bars piled on the left = suspicious).

3Retailer pairs — price-match rate

Share of shared products where the two chains post an identical price.

Retailer ARetailer BShared IdenticalRatio CV
kritikosmasoutis184980.3%0.1131
masoutissynka348046.5%0.0899
kritikossynka172244.0%0.1449
masoutissklavenitis286939.7%0.1982
kritikossklavenitis203932.7%0.2132
lidlsklavenitis79130.2%0.2174
colruytdelhaize3528.6%0.1692
galaxiasmasoutis327826.5%0.2193
galaxiaskritikos185922.8%0.2338
mymarketsklavenitis191821.4%0.1672
4Price-ending focal points

Clustering at psychological endings (.99/.95/.00) hints at shared recommended pricing.

Heuristic flags

Where to investigate — not findings of wrongdoing.

  • !1 retailer pair(s) match prices ≥50% of the time: kritikos↔masoutis (80.3%).
5Discount synchronization

Same product on offer at multiple chains at once.

9.1%
of discounted products are discounted at 2+ retailers simultaneously (187 of 2051).
Method & caveats

Built from a single price snapshot via the public PosoKanei API. The screens follow the empirical "collusion markers" competition authorities use to scope investigations: price identity, low dispersion, pairwise matching, and focal-point clustering. A near-constant price ratio between two chains (low ratio CV) is consistent with resale-price maintenance / MSRP rather than a horizontal cartel.

None of these metrics prove collusion. Rule out common-cost shocks (wholesale, energy, FX, VAT) and common ownership before drawing conclusions, and corroborate with time-series analysis of synchronized price changes.