++++ 1. Aid granted by States - Concept - Aid granted through the intermediary of a state-controlled body - Inclusion (EEC Treaty, Art. 92(1)) 2. Aid granted by States - Concept - Financial assistance granted to an undertaking by a Member State - Assessment criterion - Reasonable nature of the operation for a private investor pursuing a medium or long-term policy (EEC Treaty, Art. 92(1)) 3. Aid granted by States - Effect on trade between Member States - Impairment of competition - Aid granted to an undertaking operating in a sector where there is surplus production capacity and effective competition (EEC Treaty, Art. 92(1)) 4. Aid granted by States - Recovery of unlawful aid - Obligation flowing from the unlawful nature of the aid (EEC Treaty, Art. 93(2))