Its research covers microeconomics, macroeconomics and Marxian economics. Economics has two components&colon; macroeconomics and microeconomics. Comparative statics is a tool of analysis in microeconomics (including general equilibrium analysis) and macroeconomics. This dichotomy is roughly analogous to the difference between microeconomics and macroeconomics. In the 1920s, John Maynard Keynes prompted a division between microeconomics and macroeconomics. Neoclassical economics, currently the mainstream approach to microeconomics, usually models the firm as maximizing profit. Becker credits Friedman's course on microeconomics for helping to renew his interest in economics. Courses offered include biology, business finance, chemistry, and microeconomics. She has written over 100 academic papers and has also authored a microeconomics textbook. Such relations are used in social choice theory or microeconomics. Therefore, general equilibrium theory has traditionally been classified as part of microeconomics. It is built on the foundations of microeconomics and decision theory. Modern macro- and microeconomics are young sciences. The study of the theory from the microeconomics perspective is attributed to Blau. RB C models were created by combining fundamental equations from neo-classical microeconomics.