What troubles me more is, How did they come to ban-notes as conclusion considering the economy is mostly underground/decentrealized (ie they dont/cant have the

What troubles me more is, How did they come to ban-notes as conclusion considering the economy is mostly underground/decentrealized (ie they dont/cant have the data). (Observation) India is highly decentralized/resilient. In India, Govt is just a thing. People dont pay much mind to it. They minimize interaction with Govt and bear it when they have to. But this time I think Govt overdid it.