The factor accounting for the largest increase in the productivity of labor in the United States has been:

In the above figure, when the efficient quantity of gloves is produced, the total producer surplus is

A) $3,000. B) $15,000. C) $22,500. D) $45,000.

In the spot foreign exchange market,

A) only dollars, yen, and pounds may be traded. B) only dollars and yen may be traded. C) currencies or bank deposits are exchanged immediately. D) currencies or bank deposits are exchanged at a fixed date (or spot) in the future.