While I would not deny that there is scope for some more public investment in infrastructure or education, it is worth noting that fiscal policy in Germany is already in expansionary mode due to the cost of accommodating the refugees while the long-term sustainability of public finances calls instead for Germany, with its demographic burden, to run a structural surplus.
In any case, the sound state of the German economy does not necessitate an additional deficit-financed fiscal stimulus and – if such a measure were taken nonetheless – its positive spillover effects on other euro-area economies would be marginal at best.