FM says past govts thought of plans to eliminate black money but could not implement any scheme.
Congress leader Anand Sharma says PM Modi has plunged the country into "financial anarchy",
Modi also hit out at the Congress saying governments in the past 70 years kept quiet on black money.
Former Finance Minister P Chidambaram said the after-effects of demonetisation will continue for a longer period.
Opposition demand debate in Lok Sabha and Modi's reply.
A united opposition mounting an assault on the government over demonetisation, saying it had led to "economic anarchy" in the country.
Power Minister Piyush Goyal rejected Opposition charges that there was "leakage" of the decision.
Congress Vice President Rahul Gandhi says BJP members were alerted beforehand about the demonetisation.
Banerjee led a march to Rashtrapati Bhavan from Parliament along with members from TMC, AAP, Shiv Sena and NC.