one bad Idea

one bad idea , negative interest rates.

if you have savings you receive zero for your savings. zero or negative

what do you do when your savings earn zero, you spend less & less you don't want to consume your capital. You lay low 

The European Banking Index is destroyed trading at 91 almost at all time lows

is it possible to have a good economy with sick banks? 

The European Central Bank (ECB) pushed its deposit rate to minus 0.4 percent in April 2016: Since then, euro area banks must pay 0.4 percent per annum on their excess reserves held at ECB accounts. This, in turn, has far-reaching consequences. To start with, banks seek to evade this "penalty rate," especially by buying government bonds.