Mr. R.: Years back a good friend – a “tech incubator” and investment banker – asked me “What would make a good, easily portable medium of exchange ?” He was referencing some WTSHTF, post apocalyptic scenario. Good question. We thought about it and came up with answers, none of which were a pretty, malleable, ductile, shiny metal. Same with diamonds. Pretty. How do they taste when brewed up in the coffee-pot ? … oh yeah, they don’t! Wanna barter ? You’d better be bringing something to the table that has functional value. Food. Water. Shelter. Fire. Things that go bang. …