Hi Kai,
though I havn't read the related article, this is a pretty interesting. I personally think that both, the impact of banks on the economy in Germany and the financial help for ther PIIGS would have stronger impacts, respectivly (arrows marked in red). Doing so, the insight matrix change. Mainly that (not surprisingly) the impact of banks move to the right on the x-axis BUT, that the help for the PIIGS is a quite strong negativ factor on the german economy. though, looking at the impact on the PIIGS economy, the positiv effect is low.
Doing these changes I started wondering, what exactly is behind the direct connection between financial help for PIIGS and economy in countries like germany? ...
Anyway, the consumption in the PIIGS countries remains a main trigger for the export and therefore the economy in Germany. Hence, this would be key (if you like the concept of economic growth).
Generally, I think this small model needs more thinking. From a methodological point of view, the change of single impacts and the interpretation of these changes is a really helpful exercise.
Thanks, for the "food for thinking"...

cheers,
Ulli Lorenz