Bagels Inc. and other bakeries refer to a "baker's dozen" as consisting of a collection of thirteen baked goods. According to the UCC, this is

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A "baker's dozen" being thirteen instead of twelve is a usage of trade, which refers to a practice or method of dealing having such regularity of observance in a place, vocation, or trade that it justifies an expectation that it will be observed with respect to the transaction in question.