If firms have to account for external costs in production, then they will produce an output level that is ________ the efficient level.

When an interest in the people's problems affects the outcome, not the changes themselves, it is known as

a. hawthorne effect b. taylor effect c. laissez faire effect d. groupthink effect

A good that is excludable is one that someone can be prevented from using if she did not pay for it

a. True b. False Indicate whether the statement is true or false