a. the price of wood pulp used in the production of index cards
b. the technology in the index card production process
c. the price of packaging material (a substitute in production)
d. the price of index cards
e. the future price of index cards expected by producers
b. the technology in the index card production process
c. the price of packaging material (a substitute in production)
d. the price of index cards
e. the future price of index cards expected by producers
ANSWER:
d. the price of index cards