You must have heard, what .
This is what the picture looks like in a larger perspective.. Certainly, economies of scale are always present (ie. if the rate is low by historical standards, This means nothing. What matters is, how much it has grown and how long it has been at low levels before). But pay attention, volatility in the value of money during periods of inadequate boom, and nothing, survived the same.
no one removes the issue of debts of municipalities of course, but that's another story.