Costs are measured by explicit expenditures only, and one attempts to match revenues and the expenditures necessary to generate them on a year-by-year basis. As such, assets are depreciated over their useful lives, in lieu of deducting investment outlays in full when they are made. Firms generally do not maximize their accounting rates of return (or their ratios of operating profits to revenues or costs, or gross profits to cost of goods or operating expenses), because such courses of action will not result in the highest possible shareholder value.

Therefore, as noted, there are no market mechanisms at work to equalize these profit level indicators across firms, and, by implication, no particular reason to expect similarly situated firms to earn the same accounting rates of return, operating margins or operating markups, as noted. The use of accounting measures of profit to determine multinational firms’ country-specific income tax liabilities under profits-based methods has several important practical implications, enumerated below.

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