Banker most important Rule

Banks never goes broke has it is writing in monopoly.

Knowing that most currency are fiat currencies (wikipedia＝ money without  intrinsic value), banks can print money. 

When you print currency, if you own your saving in this currency, it means its value decrease and it will lead to inflation.  

Rule 2: printing money makes your saving less valuable and lead to inflation

Rule 1: currency has no value if not trade

"Give me control of a nation’s money supply, and I care not who makes its laws."
– Meyer Amschel Rothschild