Roy B. Kester, Accounting theory and practice… (1922)
“ On the other hand, many students of the problem view the depreciation charge as incurred for the sole purpose of determining the correct costs of doing business. Unquestionably, depreciation is a cost of production. A portion of the service life of equipment goes into each unit of the product, and depreciation constitutes a cost which must be borne by the product with as much reason as the labor power that fashions and forms it and the raw material out of which it is made. ”
