In developed economies , cash in circulation normally ranges from 6 % to 8 % of GDP .
The debts of private banks alone are already a multiple of GDP ( in the EU area , about 3.5 x the total GDP ) .
In developed economies , cash in circulation normally ranges from 6 % to 8 % of GDP , but the debts of private banks alone are already a multiple of GDP ( in the EU area , about 3.5 x the total GDP ) .