In proprietary estoppel cases involving clear promises to confer property interests, the promisee is prima facie entitled to fulfilment of the promise, not merely compensation for detriment. The gratuitous nature of the promise is irrelevant. Where the promise was unconditional, the fact that it was made in the expectation that a marriage would endure does not relieve the promisor of the obligation if the marriage fails. Detriment involving life-changing decisions with irreversible personal consequences (such as marrying, becoming pregnant, and giving up a career) is beyond the measure of money and justifies substantial fulfilment of the promise. The English 'proportionality' approach to minimum equity does not apply in Australia where the promise is clear and specific.
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