In the long run, potential growth in the economy and a rise in real gdp per capita might occur from all of the following except

a.) an increase in savings
b.) an increase in government spending on public goods
c.) an achievement in technological progress
d.) growth in population

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.