Here is a study done by the Insitute for Market on “EXPECTED LONG-TERM BUDGETARY BENEFITS TO ROMA EDUCATION IN BULGARIA (2007)”

“This analysis estimates the expected long-term benefits to investing into Roma education in Bulgaria. By budget benefits we envisage the direct financial benefits to the education to the national budget. The basic perception is that investing extra money into Roma education would pay off even in fiscal terms. In order to be successful, investments should take place in early childhood. Successful investments are also expensive, but if it is done the right way, such investments compensate the costs in terms of extra tax benefits in the future. This study looks at the expected budgetary benefits of a successful investment. However, it does not deal with how to achieve success…”

“The present value of the net budget benefits from education in one Roma child is more than EUR 82 thousand. For example, if investment is made in the education of 10 000 Roma children now, this would lead to net budget benefits of more than EUR 822 million. Respectfully, if investment in the education of 30 000 Roma children is made now, it would lead to more than EUR 2.468 billion net budget benefits.”

The article: http://ime.bg/en/articles/expected-long-term-budgetary-benefits-to-roma-education-in-bulgaria-2007/
The document: IME 2007 Report