Abstract
Macroeconomics is a branch of economics that focuses on the behavior and decision-making of an economy as a whole. We can also understand macroeconomics as the study of the entire economy in terms of the total amount of goods and services produced, total income earned, the level of employment of productive resources, and the general behavior of prices. Macroeconomists also study aggregated indicators such as GDP, unemployment rates, and price indices to understand how the whole economy functions. And finally, macroeconomists develop models that explain the relationship between such factors as national income, output, consumption, unemployment, inflation, savings, investment, government spending and international trade.
Definition:
1. Gross domestic product = gross domestic product (GDP) is the monetary value of all the finished goods and services produced within a country's borders in a specific time period. Though GDP is usually calculated on an annual basis, it can be calculated on a quarterly basis as well. GDP includes all private and public consumption, government outlays, investments and exports minus imports that occur within a defined territory. Put simply, GDP is a broad measurement of a nation’s overall economic activity. The formula to calculate the gross domestic product is as follows:
GDP = C + G + I + NX where, C is equal to all private consumption, or consumer spending, in a nation's economy, G is the sum of government spending, I is the sum of all the country's investment, including businesses capital expenditures and NX is the nation's total net exports, calculated as total exports minus total imports (NX = Exports - Imports).
How works the Macroeconomic process? (see the example below):

Analysis & Conclusion I believe that the GDP be a sum of elements used to measure the total income of a nation,