give correct answer and explain it

When a firm has diminishing marginal returns its total output diminishes. O True O False Question 9 The automobile industry is an example of an industry that is perfectly competitive. True False Question 10 Assume there is a negative change in consumer tastes and a decrease in the cost of an input. What can you predict with certainty? O The equilibrium price will decrease. The equilibrium price will increase. The equilibrium quantity will increase. O The equilibrium quantity will decrease