negligible, because there is no marginal cost. Question 18 2.5 Total economic costs (TC) include: only explicit costs, such as costs for materials, employee wages, and rent. explicit costs, such as costs for materials, employee wages, and rent, and implicit costs, such as foregone earnings on a building that is owned. only implicit costs, such as foregone earnings on a building that is owned. only variable costs, such as the cost for wages and raw materials. D Question 19 2.5