Many companies use mass-production techniques to produce identical or similar units of a product or service

Apple (smartphones), Coca-Cola (soft drinks), Chevron (gasoline), JPMorgan Chase (processing of checks), and Novartis (pharmaceuticals). These companies use a method of accounting called process costing to value inventory and calculate cost of goods sold. As you learned in financial accounting, there are several methods to value inventory; the choice of method results in different operating income and affects the taxes a company pays and the performance evaluation of managers. When prices are volatile, as has been the case recently with commodities, the impact of using a particular method of inventory valuation can be substantial.