What is the value of money anyway

This is interesting in timers of Quantative Easing where it’s difficult to asset back a good to the dollar. However, as QE occurs and the central banks buys back more securities, injecting money into the stock market, there are hopes that the dollar can be tied to other good and services than gold. In theory we are all creating money when we perform a service; it’s just that the value of service fluctuates more than gold for what its worth.