GDP stands for 'gross domestic product,' the total market value of all the goods and services produced within the nation in a year. A country's GDP is a good general-purpose measurement of how strong it's economy is and how wealthy the nation is overall.
A high GDP is the primary concern of a nation's Capitalists and will help in lowering the amount of Unemployment. However, a high GDP is also often bad for the environment, contributing to CO2 Emissions, the amount of Air Travel, and poor Air Quality. A high GDP also contributes to the Immigration rate of a nation.