Where circumstantial evidence of a defect in goods gives rise to two equally probable inferences — that the defect existed at the time of sale or arose after sale — the buyer has not discharged the onus of proving unmerchantable quality. The proviso to s 19(1) of the Sale of Goods Act 1923 (NSW) applies where a buyer selects goods by trade name from a retailer's stock without any discussion as to fitness for purpose. A judge may not supplement reasons for judgment with matters of substance after orders have been pronounced.
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