On 2 July 1954, the Nordic labour market was created and in 1958, building upon a 1952 passport-free travel area, the Nordic Passport Union was created. These two measures helped ensure Nordic citizens' free movement around the area. A Nordic Convention on Social Security was implemented in 1955. There were also plans for a single market but they were abandoned in 1959 shortly before Denmark, Norway, and Sweden joined the European Free Trade Area (EFTA). Finland became an associated member of EFTA in 1961 and Denmark and Norway applied to join the European Economic Community (EEC).