You pay $15 for an all-you-can-eat buffet. The food isn't so good, but definitely edible. When you finish eating, what is the marginal value of the last bite of food you consumed?

If a firm produces 10 units, TC=$100 . When the firm increase its output to 15 units, TC= $150 . The firm's variable costs equal to

a. $50 b. $150 c. $25 d. $100

All of the following are advertisement methods EXCEPT

A) direct marketing. B) mass marketing. C) indirect marketing. D) interactive marketing.