Good thing for the overall economy, so in this case for the EU as a whole. Increasing productive capacity overall is good because it means a society can afford

Good thing for the overall economy, so in this case for the EU as a whole. Increasing productive capacity overall is good because it means a society can afford more of the things it values. But again, the EU is in a difficult place because it's not a cohesive country. If you can't convince a German to value the well being of an Italian in the same way he values that of another German, then increasing the productive capacity of the EU as a whole doesn't help Italy at all.