"Fight against black money needs to have an element of surprise. If there is no surprise, then you cannot control black money," Prasad said in response to query on reason for the sudden scrapping of Rs 500 and Rs 1,000 notes in circulation.
Prime Minister Narendra Modi on Tuesday announced the demonetisation scheme. The banks were closed on November 9 and ATMs till November 10, which led to cash crunch in the market.
There were unending queues at banks, even on the second day, when they opened to exchange and collect invalid notes of Rs 500 and Rs 1,000 across the country, with some branches running out of cash.
SBI has also exchanged about Rs 1,500 crore worth of currency.
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People were given mix of Rs 100 and Rs 2,000 notes. But officials involved in exchange of money said people mostly wanted Rs 100 notes.
Many went a step further and got their currency exchanged from 2-3 different branches during the first day itself as there are no restrictions on number of times one can exchange notes.
The exchange facility is also available at post offices and various outlets of RBI.
In order to avert any law and order issue, security personnel were deployed at 1.3 lakh branches across the country.
ATMs were not working at many places, which also led to longer queues for withdrawal of money from bank counters.