Commonwealth of Nations
The land area of the Commonwealth nations is about , or about 21% of the total world land area. The three largest Commonwealth nations by area are Canada at , Australia at , and India at . In 2016, the Commonwealth members had a combined gross domestic product of over $9 trillion, 78% of which is accounted for by the four largest economies: United Kingdom ($2.629 trillion), India ($2.256 trillion), Canada ($1.529 trillion), and Australia ($1.258 trillion).
Commonwealth free trade
Britain's entry into the European Economic Community (EEC) in 1973, and its evolution as a member state of the European Union (EU) has meant that for practical purposes, the United Kingdom cannot independently enter into negotiations with Commonwealth states to establish a free trade agreement. Instead, the EU, as a representative of all its members, negotiates collectively. However, after the decision on 23 June 2016 by Britain to leave the EU and as the Article 50 of the EU's Lisbon Treaty has been invoked, Britain may be able to negotiate its own trade deals.