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Glossary
Local market share
A local market share measures the relative weight of a retailer or group within a defined catchment area or local market.
Why it matters
It helps read market structure before and after a deal, identify combined shares and feed the interpretation of HHI.
In practice
The calculation should rely on a credible area, comparable competitors and a coherent metric such as surface or revenue.
Common mistake
Producing a percentage without stating the area, the competitors in scope or the banner-grouping logic behind the result.
Turn point-of-sale data into usable market share / HHI analysis
See how Pyner structures catchment areas, computes indicators and prepares the material your filing needs.