A claim for restitution based on money paid at the request of another must be pleaded and analysed as a traditional money paid count, not as a direct application of unjust enrichment principles. The conceptual error of treating unjust enrichment as a directly applicable principle (rather than a unifying concept) will lead to misdirected analysis focusing on 'benefit' and 'expense' rather than on the contractual and legal arrangements between the parties. Where a trustee acts in different capacities in relation to different trusts, the requirement of mutuality for statutory set-off under s 553C of the Corporations Act 2001 (Cth) requires careful analysis of the capacity in which each relevant transaction was undertaken.
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