Variable costs would be the cost that the store paid to purchase the cards that it sells.

Variable costs would be the cost that the store paid to purchase the cards that it sells. Fixed costs would include the costs of keeping the store open, such as store rental costs, light, heat, insurance, etc. Challenging question: Would the cost of sales clerks be a fixed cost or a variable cost? Some industries costs are mostly variable costs. Can you guess what some of those industries are? Other industries costs are mostly fixed costs. Can you guess what some of those industries are?