Identify whether each of the following headlines represents a microeconomic topic or a macroeconomic topic.

a. “U.S. Unemployment Rate Reaches Historic Highs”

b. “General Motors Closes Auto Plant in Wisconsin”

c. “OPEC Action Results in a General Increase in Prices”

d. “The Cost of Health Care Rises for Employees”

e. “Lawmakers Worry about the Possibility of a U.S. Recession”

f. “Los Angeles Dodgers Make Pitcher Highest Paid Ballplayer”