product line
(ix) Product line. The term product line means a group of products that are aggregated into a single classification for accounting, marketing, or other business purposes. Examples of product lines are groups of products that perform similar functions; products that are marketed under the same trade names, brand names, or trademarks; and products that are related economically (that is, having similar rates of profitability, similar degrees of risk, and similar opportunities for growth). (8) Example. The application of the rules for determining material profit and loss statements under paragraphs (c)(4) through (7) of this section is illustrated by the following example.