Abby is so satisfied with her green grocer that she refers her friends and colleagues, providing a(n benefit of maintaining relationships with current customers.
a. social
b. psychological
c. economic
d. marketing

Aprofessional does specialized work that's primarily: degree based. medical or legal. well paying. intellectual and creative

Adecision is made at the margin when each alternative considers

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.