Iran is a country of 68 million people with a GDP of $551B (2005). Iran exports a billion barrels of oil per year worth at most (for 2005) $70B. That leaves at least $480B of other stuff they are doing. 43% of the work force is employed in industry. (Source: CIA) It's not all carpets ($1B in 1997) by a long way. Google around for lists of Iranian industries.