Economic underpinnings of paper money are not nearly as important as the political underpinnings

"...As we consider the future of the euro, it is important to remember that the economic underpinnings of paper money are not nearly as important as the political underpinnings. Paper currencies in use throughout the world today hold no value without the underlying political decision to make them the legal tender of commercial activity. This means a government must be willing and capable enough to enforce the currency as a legal form of debt settlement, and refusal to accept paper currency is, within limitations, punishable by law." Stratfor