When there is a positive externality in a free market, too much of the good is produced
and consumed.
If the demand curve for a product shifts to the left and the supply curve for the product
shifts to the left, the equilibrium quantity will decrease.
In recent years the cost of producing organic produce in the United States has decreased
largely due technological advancement. At the same time, more and more Americans
prefer organic produce over conventional produce. Which of the following best explains
the effect of these events in the organic produce market?
A) The supply curve has shifted to the left and the demand curve has shifted to the
right. As a result there has been an increase in the equilibrium quantity and an uncertain
effect on the equilibrium price.
B) Both the supply and demand curves have shifted to the right. As a result, there has
been an increase in the equilibrium quantity and an uncertain effect on the equilibrium
price.
C) Both the supply and demand curves have shifted to the right. As a result, there has
been an increase in both the equilibrium price and the equilibrium quantity.
D) The supply curve has shifted to the left and the demand curve has shifted to the
right. As a result, there has been an increase in the equilibrium price and an uncertain
effect on the equilibrium quantity.