If ______ then AVC is falling.

The invention of machinery that can double the amount of gold extracted from raw ore will likely: a. raise the world price of gold to pay for the new machinery

b. lower the world price of gold because any given amount can now be produced more cheaply. c. raise the world price of gold because miners' wages must double as their productivity doubles. d. lower the world price of gold only if new mining companies are not allowed to enter the industry.

Why is the time lag for making fiscal policy changes longer than for making monetary policy changes?