Macroeconomics

Definition: Macroeconomics is the branch of economics that studies the behavior and performance of an economy as a whole. It focuses on aggregate changes in the economy such as unemployment, growth rate, gross domestic product (GDP), and inflation. Scope of Macroeconomics: The scope of macroeconomics is wide and covers the major issues and problems of an economy:

Theory of National Income: It deals with the concepts of national income (GDP, GNP), its measurement, and the factors that determine it.
Theory of Employment: It studies the problems of unemployment and full employment in an economy. It analyzes the causes of unemployment and suggests policies to solve it.
Theory of Money: It examines the role of money in the economy and the functions of a central bank. It helps in understanding how the money supply affects the general price level.
Theory of General Price Level: It is concerned with the problem of inflation (rising prices) and deflation (falling prices), analyzing their causes and impact on the economy.
Theory of Economic Growth: It studies the factors and policies that lead to an increase in an economy's productive capacity and real national income over the long run.
Theory of International Trade: It analyzes the principles of trade between countries, the balance of payments, and the determination of foreign exchange rates.

This question is similar to the previous one and covers the scope of macroeconomics. Macroeconomics is concerned with the aggregate (total) variables of an economy.

National Income: The total income earned by the residents of a country.
Full Employment: The level of employment where all willing and able individuals can find jobs.
Total Production: The aggregate output of all goods and services in the economy (GDP/GNP).
All these are fundamental concepts studied in macroeconomics.