Everyone should have some of what would be trade/barter material in a SHTF situation.
Precious metals such as Gold and Silver
Tools, Guns and Ammo (lead)
Medicine and medical supplies including Alcohol/ hydrogen peroxide
That said, Silver and Gold in the time of Christ was standardized by the Roman government at 15-1 (15 oz of Silver to 1 oz Gold). The U.S. government at one time had it standardized at 16-1. Currently it's at about 100-1. In October 2000 Gold was $292/0z.. In 2011 it was $1800. Today it's $1600. Silver in 2011 was $47/oz. Today $14 and change.