++++ 1 . Aids granted by States - Concept - Interest rebate on export credits - Inclusion - Appraisal by Commission for the purposes of the rules on agriculture - Irrelevant ( EEC Treaty, Art . 92 ) 2 . Member States - Obligations - Exercise of powers retained in the monetary field - Unilateral measures prohibited by the Treaty - Not permissible 3 . Aids granted by States - Concept - Aid not deriving from State resources - Aid granted through public or private bodies - Inclusion ( EEC Treaty, Art . 92 ) 4 . Aids granted by States - Commission decision determining the incompatibility of an aid with the common market - Duty to state reasons - Necessary information ( EEC Treaty, Arts 92 and 190 )