Burkina Faso has an average income purchasing-power-parity per capita of $1,666 and nominal per capita of $790 in 2014. More than 80% of the population relies on subsistence agriculture, with only a small fraction directly involved in industry and services. Highly variable rainfall, poor soils, lack of adequate communications and other infrastructure, a low literacy rate, and a stagnant economy are all longstanding problems of this landlocked country. The export economy also remains subject to fluctuations in world prices.