> If the value of their currency drops substantially, will they go to war with some unknown power that's causing this drop and reverse the change? They might -

> If the value of their currency drops substantially, will they go to war with some unknown power that's causing this drop and reverse the change? They might - that’s essentially what the U.S. has done (or, at least, did for a while) when other nations tried to break the petrodollar system.