Lending should be done in gold and silver only and at a maximum of 1% interest *per annum*. But, for the first 25 years or so of le 4th reich, I envision a complete ban on all interest in every single industry. No exceptions.
This seems like how the old Goth/Germanic clans did banking. The main reason Usury worked its way into our society is how it may work its way in the future. Poisoning, assassination and the corruption of the weaker leaders. Be ever vigilant.