The economy of Vietnam is a developing mixed socialist-oriented market economy. It is the 33rd-largest economy in the world by nominal gross domestic product (GDP) and the 26th-largest economy in the world by purchasing power parity (PPP). It is a lower-middle income country with a low cost of living. Vietnam is a member of the Asia-Pacific Economic Cooperation, the Association of Southeast Asian Nations and the World Trade Organization.
Since the mid-1980s, through the Đổi Mới reform period, Vietnam has made a shift from a highly centralized planned economy to a mixed economy. Before, South Vietnam was reliant on U.S. aid, while North Vietnam and reunified Vietnam relied on communist aid until the Soviet Union's dissolution.