Social security is not apart from other aspects of growth and development. It is a phenomenon completely coherent to economic growth, social justice, human dignity and national prosperity. Generally national social security systems in most countries consist of insurance, protection and relief...

This paper attempts to estimate the size of underground economy in Iran and to identify the elements having taken a role in the creation of the same for the period 1961-2001 by using modified currency ratio method as a monetary approach to the estimation of the size of underground economy....