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The OECD has voiced concerns about the economic prospects of the eurozone if structural reforms are delayed further.

From the executive summary of the Economic Survey of the Euro Area 2005:

On unchanged policies and with population ageing the euro area’s potential output growth is set to decelerate over the next decades and eventually stabilises at around one per cent per annum by about 2020, as illustrated in the following scenario:
euroareagrowthproj
This would widen the income gap with the United States considerably. Determination in pursuing structural reforms is needed to boost growth prospects and resume economic convergence with the OECD’s best performers.