Other Things Equal, the Supply of Index Cards Is Likely

Multiple Choice

Other things equal, the supply of index cards is likely to be affected by all of the following except one.Which is the exception?

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 index cards
D) the price of packaging material (a substitute in production)
E) the future price of index cards expected by producers