MAHABIR KISHORE & ORS. vs STATE OF MADHYA PRADESH

The Supreme Court held that the doctrine of unjust enrichment applies when a defendant is enriched at the expense of a plaintiff, establishing that a refund is warranted for money paid under a mistake. The Court emphasized that the principle requires the defendant's enrichment to be unjust and at the plaintiff's expense. The Court remanded the case to the Trial Court for a decision on the merits, overturning the lower courts' dismissal based on limitation under Section 80 CPC.