[reembs]

Couldn't this achive the opposite result by pushing people to use other currency for common trading? Anyone whose main insentive to deal with cash is for illegal reasons would surely rather deal with US$ than in expiring notes.

[ajitkolathur]

Black money is like a weed. Demonetising currency is like deweeding. You pull weeds out from your lawn, your lawn looks good, for sometime. The weeds will grow again! If you don't want the weeds to grow, you must use weedicide at regular intervals. The idea of having expiry dates for currency is like using weedicide at regular intervals. The weeds can't grow so much as to deface your lawn.