When people elect to gain more education or employable skills, this results in a externality because there are
associated with this decision.
A) negative; internal costs
B) positive; external benefits
C) negative; external costs
D) positive; external costs

An allergy products superstore buys 6000 of their most popular model of air filters each year. the price of the air filters is $18. the cost of ordering and receiving shipments is $12 per order. accounting estimates annual carrying costs are 20% of the price. the supplier lead time is 2 days. the store operates 240 days per year. each order is received from the supplier in a single delivery. there are no quantity discounts. what is the store’s minimum total annual cost of placing orders & carrying inventory?