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The existence of external benefit and external cost leads to misallocation of resources. External cost For example, when drivers are not liable for the health damage of car exhaust, drivers will equate only marginal private cost with marginal benefit. But if drivers are forced to pay for the health damage of car exhaust, their marginal cost will go up by the amount of the external cost.
The firmâs overall cost of capital is based on the weighted average of these costs. For example, consider an enterprise with a capital structure consisting of 70% equity and 30% debt; its cost of equity is 10% and after-tax cost of debt is 7%.Therefore, its WACC would be (0.7 x 10%) + (0.3 x 7%) = 9.1%.EFINITION of 'Cost Of Capital'. The cost of funds used for financing a business. Cost of capital depends on the mode of financing used â it refers to the cost of equity if the business is financed solely through equity, or to the cost of debt if it is financed solely through debt.