The outspoken Governor also appeared to disapprove of the lower interest rates to boost growth, saying low rates actually lead to people saving more rather than spending.
Delivering a lecture here tonight, Rajan also suggested that the "definite slowdown" in branch expansion by foreign banks in India could be due to regulation among other reasons.
"What happens when you put pressure on one side of balloon? It balloons out on the other side. So is there a danger that by regulating the banks so strongly, we have shifted activity -- not just risky activity but human capital -- to shadow banking system," he said at a lecture here.
Rajan said the central bank knows how to regulate banks and has regulated them.
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"But we don't know how to regulate the shadow financial system and we haven't regulated that as much," he said.
It may be argued that it was the smart guys who took the bank down but smart guys also do the risk management as also correct valuations, Rajan said, while asking, "Is a less smart banking system more of a risk or less of a risk that is the question we should ask ourselves?"
This may include unregulated activities by regulated institutions and has mostly escaped regulation primarily because it did not accept traditional bank deposits.
The Reserve Bank Governor said the idea or intent behind regulation was to reduce complexity and financial engineering while creating risks for the banking system.
"But in that process have you also reduced the ability of the banks to take needed real sector risks anymore. And that is the question we have to ask," he said.
Also, there was a definite slowdown in the expansion of branches of foreign banks in India.
"That has slowed down tremendously since the (2008 financial) crisis. And one could argue that it is a fall out of the global financial crisis and the regulation," he said.
Rajan said, in a global financial crisis, banks have access to central bank window in case of liquidity shortage, but non-banks won't have access to the window to be able to cope.