Q. On 8th November 2016, with the announcement from Government of India, all the ₹500 and ₹1,000 banknotes of the Mahatma Gandhi series have ceased to be a legal tender. The givemment also announced the issuance of new ₹500 and ₹2,000 banknotes in exchange for the demonetised banknotes. Identify the concept being described in the above lines.