Difference Between Shares And Debentures. Nominal GDP estimates are commonly used to determine the economic performance of a whole country or region and to make international comparisons. Pin By Michelle Maritz On Teaching Economics Gross Domestic Product Economics Economics Lessons Gross national product GNP may be employed in countries whose economies are largely reliant on foreign profits. . Macroeconomics involves the study of aggregated indicators such as GDP unemployment rates and price indices for the purpose of understanding how the whole economy functions as well as the relationships between such factors as national income output consumption unemployment inflation savings investment international trade and international finance. Although HTML only have the element for a horizontal line. Changes brought in GDP calculations in 2015. The latter includes net revenue from overseas investments. It helps compare the gros...