An internal market operates inside an organization or set of organizations which have decoupled internal components. Each component trades its services and interfaces with the others. Often a set of government or government-funded set of organizations will operate an internal market. Services provided by an internal market are often but not always available on the open market

Open market

The term open market is used generally to refer to a situation close to free trade and in a more specific technical sense to interbank trade in securities.-Use of the term in economic theory:...

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In the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

, the BBC

BBC

The British Broadcasting Corporation is a British public service broadcaster. Its headquarters is at Broadcasting House in the City of Westminster, London. It is the largest broadcaster in the world, with about 23,000 staff...

 under John Birt introduced an internal market amongst its different components - Technology, Production, News and so on. The Thatcher

Margaret Thatcher

Margaret Hilda Thatcher, Baroness Thatcher, was Prime Minister of the United Kingdom from 1979 to 1990...

 government also introduced an internal market into the National Health Service

National Health Service

The National Health Service is the shared name of three of the four publicly funded healthcare systems in the United Kingdom. They provide a comprehensive range of health services, the vast majority of which are free at the point of use to residents of the United Kingdom...

 in 1990, which split the purchase (GP fundholders) and provision (NHS Trusts) of health care in the UK, in order to promote competition between providers within the NHS.

Other uses

• Common market or single market - a stage in economic integration
  Economic integration
  Economic integration refers to trade unification between different states by the partial or full abolishing of customs tariffs on trade taking place within the borders of each state...
  
  . For example in the European Union
  Internal Market (European Union)
  The European Union's Internal Market seeks to guarantee the free movement of goods, capital, services, and people – the EU's four freedoms – within the EU's 27 member states.The Internal Market is intended to be conducive to increased competition, increased specialisation, larger...