Burundi is a landlocked resource-poor country in an early stage of economic development. The economic development of Burundi relies on the agriculture industry where the country's prime revenue is earned from the export of coffee. Continued insecurity, overpopulation, and soil erosion have contributed to a significant contraction of the subsistence economy in recent years. Although potential wealth in petroleum, nickel, copper, and other natural resources is being explored, the uncertain security situation has prevented meaningful investor interest. Industrial development also is hampered by Burundi's distance from the sea and high transport costs. In terms of GDP per capita Burundi stands weaker in its prospects of growth. The foreign aids received from the Western Europe and other regions worldwide that sustain the economy of Burundi.