Indicate whether each of the following statements pertains to microeconomics or macroeconomics:
a. The unemployment rate in the United States was 6.2 percent in 2014.
b. Workers at the Sleepy Eye grain elevator are paid $10 per hour.
c. The productivity of American workers as a whole increased by more than 2 percent per year in the last decade.
d. The money or nominal wages of nursing aides increased by 2 percent in 2014.
e. The Alpo dog food plant in Bowser, Indiana, laid off 15 workers last month.