As of 2016, there are ______ nations fully in the Eurozone, with ______ nations remaining outside the currency union.

Potential output

a. is defined as the level of real output that the economy could produce at high rates of resource utilization. b. only occurs when both the unemployment rate and inflation rate are zero. c. can be estimated by choosing benchmark measures of high resource utilization. d. Both a and c

The invention of machinery that can double the amount of gold extracted from raw ore will likely lead mining companies to

a. raise the world price of gold to pay for the new machinery. b. lower the world price of gold because any 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.