General Court 16 May 2019, Joined Cases T-836/16 and T-624/17: Judgment of the General Court of 16 May 2019 — Poland v Commission (State aid — Polish tax on the retail sector — Progressive tax levied on turnover — Decision to open the formal investigation procedure — Final decision classifying the measure as State aid incompatible with the internal market — Concept of State aid — Condition relating to selectivity)

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