The defence under s 26(1) of the Sale of Goods Act 1923 (NSW) requires the buyer to establish common law estoppel, including a duty owed by the owner to the buyer. That duty can only arise where there is shared knowledge between owner and buyer of the situation in which the transaction occurred. An owner's mere knowledge that a dishonest person has possession of goods and could make unauthorised sales does not give rise to such a duty; the owner must also know that the person is holding himself out to a particular buyer as authorised to sell. Where the owner's inaction results from duress rather than negligence, and the buyer relies on independent observations rather than the owner's silence, the s 26(1) defence will fail.
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