This can be used to control economic growth, inflation, interest rates.
I'll be polite and just say that I'm highly skeptical of your claims that the UK pension system has accomplished all of the macroeconomic miracles that you claim in your linked articles.
And six years into negative interest rates have certainly not been as helpful to the EU / UK economies as you have stated. On the positive, it has lowered the Euro versus Dollar exchange rate (which was Draghi's real unofficial wink-wink-nod-nod goal all along). But it has also made your banking systems more unstable from a risk tolerance perspective and commercially less profitable. And the negative rates haven't stimulated the growth that you tout in the UK and EU. The UK's growth has been especially moribund quite frankly.
Please cite empirical evidence that the UK pension system has translated into UK economic growth. Not all pension funds are designed like the US 401K plans - especially public sector pensions. Even for developed economies like the US and UK, you'll find the assumed answer intuitive but the actual empirical evidence is decidedly mixed. The small and medium sized industries are the ones that need access to capital the most. And they are the ones usually excluded from most retirement plan investments.
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