United Kingdom has the ninth-largest economy by economic theory that states that the exchange rate between two currencies equal the ratio of the currencies' respective purchasing power called purchasing power parity.
The United Kingdom is a developed country and has the world 's fifth-largest economy by nominal GDP and ninth-largest economy by purchasing power parity.
Purchasing power parity -LRB- PPP -RRB- is an economic theory that states that the exchange rate between two currencies equal the ratio of the currencies ' respective purchasing power.
