Macroeconomics is the branch of economics that studies the overall workings of an economy, such as total income and output; aspects of the economy are viewed in aggregate. For instance, when referring to labor in macroeconomics, the focus is on all workers within an economy, not the choices of an individual worker.
Gross Domestic Product (GDP) and Gross National Product (GNP)
Gross Domestic Product (GDP) and Gross National Product (GNP) are the two most common measures of a nation's economic output.
Gross domestic product is defined as the value of all goods and services produced within a nation during a particular period of time (typically a year). Market prices are used to determine value and only "final" goods and services (those consumed by the end user) are included.
Gross National Product measures the income of all of a nation's citizens, even if that income was earned abroad. Amounts that foreigners earn within the nation's boundaries are not included.