The Netherlands has a constitutional monarchy and parliamentary democracy. The parliament consists of two chambers - the Lower House which is directly elected, and the Senate which is indirectly elected. The King is the nominal head of state but has no real political power. The country is usually governed by a coalition of political parties, with the Prime Minister as head of government. Dutch society has traditionally been predominantly Christian but secularization has increased, with over half the population now having no religious affiliation. The Netherlands has a very prosperous and open economy heavily dependent on foreign trade, especially in agriculture, food processing, chemicals and transport.