The book covers various kinds of financial crisis that range from currency debasement to hyper inflation, but I focused mainly on sovereign default.
Sovereign Default is an interesting economic crisis because it only occurs when one nation fails to pay back another nation. Most of these episodes in modern times are only partial defaults because if a nation defaults their creditors will just simply help them restructure their payment schedule. Another interesting point is that such a default is considered apart of the graduation process for emerging markets.
Also If a government can not collect tax’s or borrow it will simply roll out the printing press in order to inflate their way out of debt. I forget which country did that,but I am looking it up right now.