Well there are two ways of really explaining this, but "The Common Good" by definition is something that benefits or interests of everyone.
The political term, is literally the same thing; "What is shared and beneficial for most members of a given community"
Hope this is the answer you are searching for.
Yes very much so. Someone might feel entitled to have power and authority creating the person to become a tyrant
<span>Troubles between Monarchy and the nobility over the tax system led to paralysis and bankruptcy</span>