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
Because of their very different economic profiles Commonwealth countries' interests are not always aligned. In principle, resource exporters such as Canada, Australia, and most of the Caribbean and African Commonwealth countries are complementary to resource importers such as the United Kingdom and India. However, the historical trade ties between them were based on terms which were dictated by the Colonial Office in Britain. Since the former dominions and colonies have achieved independence, they are free to refuse British initiatives and seek better deals elsewhere. Specifically, agricultural exporters in the Cairns Group (including members Australia, Canada, New Zealand, Pakistan, and South Africa) are at odds with the importing countries at the World Trade Organization. These countries pursue independent trade policies. Notably Australia (2005) and Canada (1988), and Singapore (2004) have free trade agreements with the United States, and New Zealand (2008) has one with China. Meanwhile, New Zealand and Singapore are already members of the Trans-Pacific Strategic Economic Partnership, which Australia, Canada and Malaysia are attempting to join (along with major non-Commonwealth countries). Furthermore, the proposed Comprehensive Economic Partnership for East Asia would include Malaysia, Singapore, Brunei, India, Australia, and New Zealand.