Here are some numbers that provide for some interesting thought experiments regarding the future Bitcoin economy.
I wanted to get an idea of how Bitcoin would scale as a global reserve currency.
I went to the CIA World Fact Book at: https://www.cia.gov/library/publications/the-world-factbook/
to find the number of people on planet Earth. I found:
World population = 6,928,198,253 (July 2011).
At the time of this writing there are an estimated 6,884,000 Bitcoins in existence. This means that if we were to evenly distribute Bitcoins throughout the world each person on Earth would get (6,884,000 / 6,928,198,253) = 0.0009936205271 Bitcoins/person.
Even if all the Bitcoins that could ever be created (21 million) were distributed over the current world population this would represent (21,000,000 / 6,928,198,253) = 0.00303109109081 Bitcoins/person.
I wanted to find a number that represented the world monetary value. In the CIA World Fact Book I found a (year 2010) value for World GDP (purchasing power parity) of 74.5 trillion U.S. Dollars.
If we were to distribute that value over the number of Bitcoins that currently exist that would be ($74,500,000,000,000 / 6,884,000) = $10,822,196.40/Bitcoin.
If we calculate that over the total number of Bitcoins that will ever exist: ($74,500,000,000,000 / 21,000,000) =$3,547,619.05/Bitcoin
I think the current exchange value of USD/Bitcoin on Mt. Gox has a lot of room to grow!