A main product is a joint output that generates a significant portion of the net realizable value (NRV) within a joint production process. The classification of a product resulting from a joint production process as either a main product or a by-product has relevance in the context of cost management because costs are only allocated to main products, not to by-products.[1]


  1. ^ Wouters, Mark; Selto, Frank H.; Hilton, Ronald W.; Maher, Michael W. (2012): Cost Management: Strategies for Business Decisions, International Edition, McGraw-Hill, p. 538.