Which of the following is the best synonym for "marginal" in economics?

If the long-run average total cost curve is downward-sloping, then the firm is experiencing decreasing returns to scale

Indicate whether the statement is true or false

Sally is shopping for textbooks at the beginning of the semester. What is one reason she might decide to not purchase a textbook?

A) Her expected producer surplus is positive. B) Her expected consumer surplus is negative. C) Her expected consumer surplus is positive. D) Her expected profits are positive.