Kernrechtsfrage
Whether the cantonal court violated federal law by increasing the labour-market earnings deduction to 25% when calculating invalid income.
Extrahierter Entscheid
No. Considering age and other case-specific factors, a 25% deduction was within permissible discretion and not a legal error.
Extrahierte Begründung
The Supreme Court held that it cannot review mere appropriateness. The cantonal court relied on relevant wage-lowering factors, including advanced age and long service, and did not substitute its own discretion unlawfully.