According to this website [0], the above-ground gold is valued at about $8.5 trillion USD. As this website [1] points out, the M2 amount of USD in the world's supply is $9 trillion. USD makes up about 15% of the total world's supple of $60 trillion.
This HN thread is by far the most interesting one I've read about speculating Bitcoin's future value.
This HN thread is by far the most interesting one I've read about speculating Bitcoin's future value.
[0] http://www.numbersleuth.org/worlds-gold/ [1] http://erikaugust.com/blog/thought-on-bitcoin