Answer:
Indeed, the cost of goods sold account is part of a trading business, but not seen in the income statement of a service business, because in a service business, no material goods are sold to the consumers. In this way, contrary to what happens in the sale of goods, in the sale of services the seller does not offer a material with a previous production cost to the buyer, but rather offers the performance of a certain task, with which there is no material component in the offer, but rather an execution of an act and the knowledge of how to carry out said execution by the person providing the service.