Argument: Turkey is too poor and underdeveloped to join the EU
"Turkey’s Membership Application: Implications for the EU". Jean Monnet/Robert Schuman Paper Series. Vol. 5 No. 26. August 2005 - "Level of economic development. Turkey is a significantly poorer country than any of the ten states which joined the EU in May 2004 and is also poorer than Bulgaria and Romania which are scheduled to join in 2007. Despite its current population accounting for 15 per cent of the EU-25 population, its GDP is equivalent to just 2 per cent of the EU-25 GDP. Its GDP per capita is 28.5 per cent of the EU-25 GDP (European Commission, 2004c: 13)."