6. 2 we cannot calculate fixed cost If a firm shuts down in the short run and produces no output, its total cost will be a zero b. equal to total variable cost e. equal to total fixed cost d. equal to explicit costs only e. impossible to calculate Exhibit 7-8 c. 1/0 $8 D $1 a. b. Q/1 10 7. In Exhibit 7-8, the vertical distance between lines B and C at any level of output represents a. marginal cost b. average total cost c. average variable cost d. average fixed cost e. average marginal cost 8. In Exhibit 7-8, when output is 10, total cost equals $10 fixed cost equals $1 c. variable cost equals $10 d. marginal cost equals $10 e. fixed cost equals $10 9. In Exhibit 7-8, when output is 10, a. total cost equals $80 b. fixed cost equals $10 c. variable cost equals $70 d. marginal cost equals $10 e. fixed cost equals $7 10. In Exhibit 7-8, curve B represents a marginal cost b. average total cost c. average variable cost