I don't know how it's going to resolve, but there's going to be a crisis."

"We're dealing now in very early days a crisis which has got a way to go. If we went back on the gold standard and we adhered to the actual structure of the gold standard as it exited prior to 1913, we'd be fine.

Remember that the period 1870 to 1913 was one of the most aggressive periods economically that we've had in the United States, and that was a golden period of the gold standard."

http://www.zerohedge.com/news/2016-06-27/greenspan-warns-crisis-imminent-he-urges-return-gold-standard