Also, some of the most valuable companies are not listed on any stock market, so the stock market is not necessarily any kind of full picture of the worth of the country. For example: http://www.ft.com/cms/s/2/5de6ef96-8b95-11db-a61f-0000779e23...

Yeah, Saudi Aramco 2005 is still worth more than Apple right now.. but oil has fallen so maybe this has changed.