The subject of the Study of Macro Economics is based on which principle?

Correct option is A

The subject of the study of macroeconomics is based on the principle of national income.
• This principle focuses on the study of the economy as a whole, including factors such as aggregate output, income, employment, and inflation.
• Macroeconomics examines the behaviour and performance of the economy at the national or regional level, rather than individual markets or firms.
• It deals with the analysis of economic aggregates and the relationships between different macroeconomic variables.
• The study of macroeconomics helps in understanding the functioning of the economy and in formulating policies to achieve specific economic objectives, such as stable prices, high employment, and sustainable growth.