Gross Domestic Product showing the state of the national economy. According to the Keynesian model, GDP is calculated as a sum of consumption volumes, investments, government spending and exports and imports subtracted. Gross Domestic Product is calculated both in the form of index (ratio of current period and earlier period) and absolute value (sum of prices on goods and services produced in the country). The difference between actual value of GDP and predicted value can influence on online forex market a lot. GDP growth directly depends on the national currency rate growth.