Which of the following individuals is using stress management techniques? A.
Preston gets really stressed if he gets behind so he will occasionally stay late after work in order to stay on schedule.
B.
Emily used to get really nervous asking her boss questions, but then she changed her perception when she realized her boss appreciates her asking questions.
C.
Zach always plays basketball with co-workers after they have a stressful day.
D.
All of the above

Which of the following statements is (are) true? i. free entry to a perfectly competitive industry results in the industry's firms earning zero economic profit in the long run, except for the most efficient producers, who may earn economic rent. ii. in a perfectly competitive market, long-run equilibrium is characterized by lmc < p < latc. iii. if a competitive industry is in long-run equilibrium, a decrease in demand causes firms to earn negative profit because the market price will fall below average total cost.