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Gross margin can be expressed as a percentage or in total financial terms. If the latter, it can be reported on a per-unit basis or on a per-period basis for a business. "Margin (on sales) is the difference between selling price and cost. This difference is typically expressed either as a percentage of selling price or on a per-unit basis.
Profit margin in an economy reflects the profitability of any business and enables relative comparisons between small and large businesses. It is a standard measure to evaluate the potential and capacity of a business in generating profits. These margins help business determine their pricing strategies for goods and services.
A good operating margin is needed for a company to be able to pay for its fixed costs, such as interest on debt. A higher operating margin means that the company has less financial risk. Operating margin can be considered total revenue from product sales less all costs before adjustment for taxes, dividends to shareholders, and interest on debt.
Multiplying each firm's profit margin by its market share gives us: + + = where is the Herfindahl index. Therefore, the Herfindahl index is directly related to the weighted average of the profit margins of firms under Cournot competition with linear marginal costs.