An increase in a perfectly competitive firm's demand for labor could be caused by an increase in the market demand for the firm's product.
a) an increase in the quantity of labor supplied.
b) a decrease in the market wage rate.
c) a decrease in the marginal product of workers.

Which of the following is the best example of substitution? a. movie producers begin making more comedies because they cost less to make than action films. b. people walk out before the end of a movie because the acting and the plot are terrible. c. people at the movie theater switch from popcorn to candy because popcorn has gotten too expensive. d. more people begin going to matinee movies instead of night movies to save money on the tickets.