"These are not easy issues to solve. I think it is important that a great deal of importance be focused on curtailing the mechanism by which money continues to go out of India. That has more chance of success than getting very much black money back into India," US-based Global Financial Integrity (GFI) president Raymond Baker told PTI.
India has replaced Malaysia as the fourth largest exporter of black money after China, Russia and Mexico for the 10-year period from 2003-2012.
These figures are on the conservative side and the actual amount could be much larger, Baker said.
"Getting black money back for any country is a hard thing to do, because international mechanism does not basically support this," he said, noting that the major western countries like the US and UK, which are the main beneficiaries of black money from countries like India would not like to stop this illicit flow of money into their economies.
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The money generated through tax evasion is the bulk of the illicit money that has gone out of India, he said.
One of the things, Baker said, that Prime Minister Narendra Modi could do "very effectively" is to put this issue much more effectively and solidly on the agenda of the G-20.
"This issue is crying out for a major figure from the emerging market and developing world to insist that this must be addressed at the level of G-20," Baker said.