Now eurozone leaders are hailing the package as a further step towards closer co-operation and integration.

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The real cost however is in the operation and overall management or integration of Big Data within the existing ecosystem.

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This has a role to play, especially in political co-operation and (pace Mr Kirchner) energy and transport integration.

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Baroness Williams said fiscal integration - such as tax co-operation between eurozone countries - was now likely and it would require "a substantial new treaty" or amendment to the Lisbon Treaty.

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