1 . ECSC - PRODUCTION - PRODUCTION QUOTA SYSTEM - INCLUSION OF EXTERNAL TRADE - COMMISSION ' S POWER TO DECIDE - CONDITIONS FOR EXERCISE OF SUCH POWER - PRODUCTION INTENDED FOR EXPORT TO NON-MEMBER COUNTRIES - NO OBLIGATION TO EXEMPT FROM QUOTA SYSTEM ( ECSC TREATY , ART . 58 ) 2 . ECSC - PRODUCTION - STEEL PRODUCTION QUOTA SYSTEM - DECISION NO 2794/80 - RETROACTIVE EFFECT - LIMITS 3 . MEASURES ADOPTED BY THE INSTITUTIONS - APPLICATION RATIONE TEMPORIS - PRINCIPLE OF ABSENCE OF RETROACTIVE EFFECT - EXCEPTIONS - CONDITIONS 4 . ECSC - PRODUCTION - PRODUCTION QUOTA SYSTEM - PURPOSE - GUARANTEE OF A MINIMUM LEVEL OF PRODUCTION AND A MINIMUM LEVEL OF EMPLOYMENT FOR EACH UNDERTAKING - DUTY IMPOSED ON THE COMMISSION - ABSENCE ( ECSC TREATY , ART . 58 ) 5 . ECSC - AIMS - CONSTANT RECONCILIATION ( ECSC TREATY , ARTS 2 , 3 AND 4 ) 6 . ECSC - PRODUCTION - STEEL PRODUCTION QUOTA SYSTEM - UNDERTAKING ' S PRODUCTION IN EXCESS OF ITS QUOTA - EMERGENCY - EMERGENCY DUE TO UNDERTAKING ' S SERIOUS ECONOMIC DIFFICULTIES - PRINCIPLE NOT APPLICABLE ( ECSC TREATY , ART . 58 ; DECISION NO 2794/80 )