Ouro

"Gold is unlike any other commodity. It is costly to extract from the earth and to refine to a reasonable degree of purity. It is costly to store. It has no remaining uses as a producer good - equivalent or superior alternatives exist for all its industrial uses. It may have some value as a consumer good - somewhat surprisingly people like to attach it to their earlobes or nostrils and to hang it around their necks. I have always considered it a rather vulgar metal, made for the Saturday Night Fever crowd, all shiny and in-your-face, as opposed to the much classier silver, but de gustibus… . 

The total stock of ‘above-ground’ gold is about 160,000 metric tonnes (a metric ton is 2,204 lbs. or 35,264 oz, for those of a non-decimal mind-set). About 50 percent of this existing stock of above-ground gold is kept as a pure a store of value (for investment purposes), most likely somewhere below-ground, for security reasons. The other 50 percent exists as jewellery.[...] 

In a world with multiple fiat moneys, the zero value of money equilibrium lurks for each of the fiat currencies, including gold. Admittedly, as regards gold, so far so good. Gold has positive value. It has had positive value for nigh-on 6000 years. That must make it the longest-lasting bubble in human history. 

I don’t want to argue with a 6000-year old bubble. It may well be good for another 6000 years. Its value may go from $1,100 per fine ounce to $1,500 or $5,000 for all I know. But I would not invest more than a sliver of my wealth into something without intrinsic value, something whose positive value is based on nothing more than a set of self-confirming beliefs."

FT.com | Willem Buiter's Maverecon | Gold - a six thousand year-old bubble