In commerce, double billing is the error of charging a customer twice for the same unique product. This can occur due to a change in product name^[1] or due to a software error.^[2]

The American Bar Association prohibits double billing.^[3] In 1998, Cameron Stracher's book Double Billing^[4] suggested that double billing is common in law firms, but that implication was misleading.^[5]

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