PosoKanei · Greek supermarket price comparison

Price-Coordination Screen

Statistical screening for cartel-like pricing · generated 2026-06-21

Competitive (low concern)
Healthy price dispersion market-wide; check flagged pairs.
352
products fully identical
5.9% of multi-retailer
8.1%
median price dispersion
low = suspicious
1
suspicious retailer pairs
194 pairs evaluated
5970
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
kritikosmasoutis193480.3%0.1108
masoutissynka348046.5%0.0915
kritikossynka180143.6%0.1433
masoutissklavenitis298539.7%0.1973
kritikossklavenitis213032.8%0.2125
colruytdelhaize3831.6%0.1631
lidlsklavenitis82830.9%0.2143
galaxiasmasoutis327526.6%0.2198
galaxiaskritikos194122.5%0.2313
mymarketsklavenitis177621.1%0.1665
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.

8.9%
of discounted products are discounted at 2+ retailers simultaneously (181 of 2044).
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.