A few summers ago, I remember consuming extra calories from sugar candies or purchasing random things just because the store went out of enough change. Today, the street hawker at your doorstep will tell you “Paytm Karo” or show you his UPI barcode. Imagine those days when people would physically carry a large amount of cash while traveling or going shopping. There was a time when people used to have secret pockets to keep all those extra cash. Cash was replaced by cards and now, you need nothing but your mobile phone. “It is necessity and not pleasure that compels us.” ― Dante Alighieri, Inferno . Who can understand this better than an Indian who had spent hours in long queues outside ATM to finally realize that he still can’t buy two packets of milk and bread with a 2000 rupee note? Consumers randomly purchased items to get their 2000-rupee notes exchanged. Paytm was the simplest answer to all the problems of demonetization and became an overnight star. I...