What does laura do that shows she is brave?
a.
laura finds an arrowhead.
b.
laura moves her sisters out of danger.
c.
laura stands up to an indian.
d.
laura hunts with her pa.

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.