Reiterating comments made on Bitcoin last year, JP Morgan CEO Jamie Dimon yet again termed cryptocurrencies a \u2018scam\u2019 which need to be shut down. The veteran banker told Bloomberg that he has no interest in Bitcoin. Since governments are unable to control these cryptocurrencies, these should be shut down by them, he also told Bloomberg. Earlier, in September last year Jamie Dimon had called Bitcoin a fraud. He had then said that he would fire any employee he founds trading bitcoin for being \u2018stupid.\u2019 If a JPMorgan trader began trading in bitcoin, he had said, \u201cI\u2019d fire them in a second. For two reasons: It\u2019s against our rules, and they\u2019re stupid. And both are dangerous.\u201d \u00a0He had also said that the cryptocurrency \u201cwon\u2019t end well,\u201d and will eventually blow up. \u201cIt\u2019s a fraud\u201d and \u201cworse than tulip bulbs,\u201d he had famously said then in an investor conference. Jut days back, in a hard-hitting opinion in the New York Times titled \u2018Transaction Costs and Tethers: Why I\u2019m a Crypto Skeptic\u2019, noted economist Paul Krugman had said, \u201c\u2026Cryptocurrency enthusiasts are effectively celebrating the use of cutting-edge technology to set the monetary system back 300 years.\u201d \u201cBanknotes worked because people knew something about the banks that issued them, and these banks had an incentive to preserve their reputation. Governments have occasionally abused the privilege of creating fiat money, but for the most part governments and central banks exercise restraint, again because they care about their reputations,\u201d Paul Krugman wrote. \u201cBut you\u2019re supposed to be sure that a Bitcoin is real without knowing who issued it, so you need the digital equivalent of biting a gold coin to be sure it\u2019s the real deal, and the costs of producing something that satisfies that test have to be high enough to discourage fraud,\u201d he had added.