The economy of Azerbaijan is based on industry, agriculture, and on services including tourism. The energy sector based on the large reserves of crude oil and natural gas, is the main source of economic growth in Azerbaijan today, though half of the Azerbaijani people earn their income directly or indirectly through services and a third earn their income through agriculture. The energy boom has led to massive foreign direct investment and the growth rate of the Azerbaijani economy is one of the world's highest.