D) 9
Which of the following describes how a positive externality affects a competitive
market?
A) The externality causes a Difference between the private benefit from consumption
and the social benefit.
B) The externality causes a Difference between the private benefit from production and
the social cost of production.
C) The externality causes quantity demanded to exceed quantity supplied.
D) The externality causes a Difference between the social cost of production and the
social cost of consumption.
The Santa Fe Spark Plug Company supplies spark plugs to automotive parts dealers. An
increase in the demand for its product led Santa Fe to hire 150 new workers. Santa Fe
also plans to expand the capacity of its plant but this project will take 2 years to
complete. Which of the following statements is true?
A) The wages and benefits paid to the new workers are implicit costs.
B) The long run for Santa Fe is longer than 1 year.
C) The short run for Santa Fe is 1 year.
D) In the short run Santa Fe’s variable costs increase, but its fixed costs decrease.