stylistic:tone
Analytic framework

Subsequent case law and academic writing has given greater content to this commonly accepted framework. The application of the formula can be illustrated by Kelly v Solari. In that case, a company paid out a life insurance policy to a widow by mistake. The company brought an action for money had and received against the widow, seeking restitution of the mistaken payment. Analysed in modern language, the widow had been enriched at the company's direct expense. The 'unjust factor' was mistake: the company had conferred the benefit whilst labouring under the incorrect tacit assumption that the payment was due.