Analyse the tension between the economic and political costs and benefits of the Eastern enlargement of the EU.

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the essay needs to be written in British academic standards, and in British English.
note that the aim of the essay is not to outline the political and economic costs and benefits of the Eastern enlargement of the EU, but instead to analyse THE TENSION BETWEEN THEM. Of course some space needs to be dedicated in introducing them, but this is not the aim of the essay.Also provide graphs and charts at sections where they could be applied to backbone statements.