The Australia–New Zealand Closer Economic Relations Trade Agreement, commonly known as Closer Economic Relations (CER), is a free trade agreement between Australia and New Zealand. It came into force on 1 January 1983, but the actual treaty was not signed until 28 March 1983 by the Deputy Prime Minister of Australia and Minister for Trade, Lionel Bowen and the New Zealand High Commissioner to Australia, Laurie Francis in Canberra, Australia. This was because Malcolm Fraser and Robert Muldoon hated each other personally to such an extent that they refused to ratify the agreement if the other was there.

Sir Robert David Muldoon was a New Zealand conservative politician who served as the 31st prime minister of New Zealand, from 1975 to 1984, while leader of the National Party. Departing from National Party convention, Muldoon was a right-wing populist and economic nationalist, with a distinctive public persona described as reactionary, aggressive, and abrasive.