Compulsory vaccines are a financial relief on the health system  Commonly-used vaccines are a cost-effective and preventive way of promoting health, compared to the treatment of acute or chronic disease. In the U.S. during the year 2001, routine childhood immunizations against seven diseases were estimated to save over $40 billion per birth-year cohort in overall social costs including $10 billion in direct health costs, and the societal benefit-cost ratio for these vaccinations was estimated to be 16.5 billion. [1]  Another aspect is also, that productivity rates remain high and less money is earmarked for social and health transfers because people are healthier. This is also supported by a WHO study, that claims: “We calculate that the average percentage increase in income for the children whose immunization coverage increases through will rise from 0.78 per cent in 2005 to 2.39 per cent by 2020. This equates to an increase in annual earnings per child of $14 by 2020. The total increase in income per year once the vaccinated cohort of children start earning will rise from $410 million in 2005 to $1.34 billion by 2020 (at a cost of $638 million in 2005 and $748 million in 2020).” [2] This study based on economic and health indicators is part of the world immunization program GAVI.  [1] Wikipedia. Vaccine Controversy.   [2] David Bloom, David Canning and Mark Weston, The value of immunization, World Economics, July – September 2005  , accessed 05/28/2011