It's a physical estimation of the troy ounce coin value, where troy ounce => .1.1x ounce and the 5% valuation emerges by trust in purity and availability. I'm talking TAX FREE coin investlent on a physical level. No ETF no worthless papers that claim you have this coin somewhere... (My educated guess, there is about 500% less gold in the earth crust as is currently claimed to be mined and stored on paper => see ppm Au , Ag , Pt compared to the effective mass of the continental crust .. (40% Earth surface)) Be clever, DYOR but this time no shit just science :-)