1. History of GDP Before the invention of the GDP the statistical concept of a national average income made sense in theory. Although nearly impossible to distinguish because of the blurred lines on data to include/exclude. The two events leading to the invention of the GDP: great depression & World War II Don't need help with History of GDP I need help with Economics of GDP PLEASE Please Include your sources. I1. Economics of GDP Need Help with some research A couple paragraphs should be fine