Gross domestic product (GDP) is used to measure the value of goods and services produced in a country over a period of time. GDP has four main components: consumption (C), investment (I), government spending (G), and net exports (X-M). Consumption includes durable goods, non-durable goods and services. Durable goods contribute 5.4% to India's GDP while non-durable goods contribute 23.3%. Services are the fastest growing and contribute 54.4% to India's GDP. Investment and government spending contribute 31.6% and an unspecified percentage, respectively. Net exports depend on whether a country exports or imports more goods.