Question

Discuss the usefulness of demonetization as an instrument to check underground economy?

Answer 1

Helped to pick up black money
Government Could now quickly catch fake notes
They caught people who exchanged blacks

Answer 2

Demonetisation is a way of eradicating the money value from the economy as a form of any exchange. Its where the exchange of goods and services are made effective and possible without any use of the monetary value. It is where the value of goods may be measured  using another product and in turn the exchange process is stirred to take to place.