The outspoken Governor also likened the situation in India to that of small and medium enterprises (SMEs) in industrial countries, saying a need for faster growth is the central factor in both scenarios.
Rajan, who has also served as Chief Economist at the IMF, said the greater demand on banks to hold capital in the post-financial crisis scenario has come at a cost.
"It made sense post financial crisis to ask banks to hold more capital. But one of the concerns bankers have been expressing, even if bankers may have low credibility because they have cried wolf too often, that eventually it will... create greater aversion to taking on risky lending.
India has been assigned the lowest investment grade rating with a high risk profile by various global agencies.
Rajan was delivering a lecture titled 'Why Banks?' as part of the Marshall Lecture 2015-16 series at Cambridge University last evening.
Rajan, on-leave Professor of Finance at the University of Chicago's Booth School,used what is described as "matchstick theory" in an attempt to highlight why doing away with banks was not essentially a viable option.
Addressing a largely student and academic audience of the two-day lecture series organised by the university's Faculty of Economics, he said, "There is a reason why banks operate. All these proposals to do away with banks, to my mind, will cause serious costs on the system, it will increase the cost of financing and therefore we have to be very careful.
