Currencies exist because… we can’t all just get along. The US has its own currency. So does Australia. So does Israel. And Russia. France, Germany, Spain, … used to have their own currencies but they were being crushed in the marketplace because their countries were financially so weak as individuals that “nobody” wanted their currencies – they teamed up and created a Euro. It gave them more heft in the marketplace to manage against titans like the U.S. but then one day, one ugly day, Greece said “we can”t really pay our bills." Bad things happened.