In a bundle of 15 cassation judgments, the Tribunal Supremo, the highest civil court in Spain, rules on important questions concerning the ability of the judge to estimate the damage, the need for prior inter partes disclosure, proportionality, and standards for economic expert opinions. The Tribunal does so against the background of the European trucks cartel, the same case that prompted the preliminary ruling in Tráficos Manuel Ferrer. The Tribunal largely upholds the findings of the appellate courts and strengthens the ability of judges to estimate damage. The court also rules, among other questions, on the accrual of interest and limitation.