Boom - Life is good 'cause everybody's rich. While a boom can't last forever, it may allow a great deal of local development. But watch out, a Crash may be just around the corner. And don't forget the authorities will want their fair share in taxes as well. Crash - The gold coin isn't worth what it used to be.
People can barely afford to eat, let alone pay taxes.
Will almost certainly lead to a Crime Wave, and probably to Civil Unrest. Will almost certainly lead to a Mass Exodus is a battle is prolonged or ongoing. Of course, escaping locals may be more vulnerable than those staying put. War can lead to nearly any or all fo the other social disasters listed - Famine, Civil Unrest, Major Political Upheaval, economic disruption. Tell us something we don't know.