According to my friend with IMF it will start in a noticeable fashion when our debt clock hits 20 trillion. She said they are shooting for 2021 for the total collapse of the US dollar. After we hit our debt ceiling America is technically bankrupt as our debt is passed GDP. We will have intermittent shocks to the system where money isn't available as they merge the 3 currencies of North America and work on the underlying value and structure of the currencies. It isn't the look that changes it is the underlying value and structure. I wrote a longer article explaining the 5 stages of a central banking cycle. Our debt clock has backed up at least 4 times since February. www.usdebtclock.org