Collective consumer action. Request for judicial ratification of the Addendum to the Collective Agreement on Economic Plans (Bresser, Verão, Collor I and Collor II), entered into between AGU, consumer associations, FEBRABAN and CONSIF. Partial ratification with reservation as to the arbitration clause. Construction of Article 4, §2º of the Brazilian Arbitration Act. Impossibility of subjecting savers (consumers) to arbitration. Contract of adhesion. The public interest involved in the subject matter of the agreement contrasts with the confidentiality of any future arbitration proceedings: