Mostaza Claro v Centro Móvil Milenium SL Case C-168/05, [2006] ECR I-10421
Facts
Elisa María Mostaza Claro entered a mobile telephone contract containing an arbitration clause. After she failed to complete the minimum subscription period, the supplier pursued arbitration and obtained an award against her. She had participated in the arbitration without challenging the clause’s validity. When seeking annulment of the award in court, she argued that the clause was unfair under the consumer-terms directive. The Spanish court asked whether her failure to raise the point before the arbitrator prevented judicial examination of the unfair term.
Legal Issue
Must a court hearing an application to annul an arbitration award examine an unfair arbitration clause even though the consumer did not challenge that clause during arbitration?
Held
The Court held that the consumer’s omission did not prevent the national court from examining the clause and annulling the award if the arbitration agreement contained an unfair term. Directive 93/13 addressed an imbalance in bargaining power and information between consumers and suppliers. Effective protection could require positive intervention by the court, rather than complete reliance on the consumer raising every point at the earliest stage. The public interest underlying the directive justified that approach. The ruling concerned a court properly seised of annulment proceedings; it did not establish that every final award must be reopened regardless of national time limits or procedural context.
⭐ Legal Principle
A court hearing an application to annul a consumer arbitration award must examine whether the arbitration agreement contains an unfair term, despite the consumer’s failure to raise invalidity during the arbitration.
Significance
Mostaza Claro illustrates the effect of EU consumer protection on national procedure. The consumer’s earlier silence did not cure an unfair arbitration clause. Asturcom later addressed a different situation involving a final award and an inactive consumer, so the procedural posture must be kept clear. The case does not support a blanket assertion that the principle of effectiveness abolishes res judicata whenever EU law is involved.
Common exam questions about this case
Why did the consumer’s earlier silence not settle the issue?
The directive recognised that consumers may lack bargaining power and legal knowledge. Making protection depend entirely on raising unfairness during arbitration would undermine that protection. The court hearing the annulment action therefore had to examine the arbitration clause despite the consumer having omitted that argument earlier.
Does the judgment require every final award to be reopened?
No. It concerned a court already hearing an application to annul the award. Whether a final, unchallenged award can later be enforced raises different procedural questions, as Asturcom shows. An answer must identify the stage of proceedings and applicable rules rather than generalise from the result alone.
What should a court do if it finds the arbitration clause unfair?
In the procedural setting considered, it must determine the clause’s invalidity and annul the resulting award. That response gives practical effect to the directive’s protection. The court still needs to assess the actual clause against the relevant unfairness framework; arbitration is not inherently prohibited in every consumer contract.