Which of the following best describes the difference between micro and macro economics ?

a. Microeconomics is about large markets and financial assets, Macroeconomics is about markets for the factors of production

b. Microeconomics is about individuals, households, and firms, Macroeconomics is about the economy as a whole

c. Microeconomics is about efficiency, Macroeconomics is about equity

d. Microeconomics is about normative economics, Macroeconomics is about positive analysis