The other problem is that the Economists who try to control it and debug it are terrible at understanding it. Every countries economy is subtly different, but they have a one size fits nobody, and doesn´t even have the right number of sleeves approach to it.
For example, Greece.
http://www.tradingeconomics.com/greece/money-supply-m3
Expand it out to the max - this is an old style, US Great Depression monetary collapse. Their money supply has dropped by about a third since 2009. Some of that is loan write-offs, a lot of it is money being withdrawn from the country, either by rich people who want their money in safer banks, or as debt repayments to european banks. Cost of being in the Euro, very hard to stop this.
Knowing that the money supply has dropped by 1/3, we also know that the lending supply has dropped by 1/3, loans create money etc. Knowing that credit influences prices, we know that property prices are dropping through the floor. Knowing all that, we also know that tax revenue has dropped, because there´s less money circulating to be taxed. (Well, it´s a bit more complex than that but not much.)
The big issue in this kind of monetary collapse is very simple. In a market based economy, most prices can adjust to changes in the money supply and production over time. The one exception is debt, which keeps its coupon value until people default.
Revalue Greece debt though, and there goes a whole bunch of European banks with greek debt on their books, and a GFC style cascade failure to who knows where in the system.
It probably could still all be sorted out if we put some decent computer scientists on the case, but I certainly don´t expect the economists to get there in time.
So I guess Greece will just have to invade Germany.