"We may also lose Rs 4.7 lakh crore in our GDP," he said in an interview to Karan Thapar on India Today news channel.
The old high denomination notes were demonetised from November 9. Since then long queues are being witnessed at bank branches and outside ATMs for cash withdrawal.
"Just imagine for Rs 400 crore of supposedly fake money, according to the government itself, you kill or demonetise over Rs 14.5 lakh crore or may be Rs 15 lakh crore.
Mitra said the government's decision to demonetisation the will provide no gain, but only acute pain.
He also said the demonetisatin "is perhpas the biggest scam that is about to happen".
"If these figures (deposits of old notes in banks) are right because what it seems to me is if all the money comes back there was not enough black money...
"This has two serious implications. One, it could be that the government was purely ignorant because it does not consult anybody...Or they have in effect facilitated some people from converting black into white, effectively ending up with no RBI surpluses," he said.
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