You can print new fiat money. The tried and true ways are: - Make loans that with less than 100% reserve backing (be a bank) - Print up your own negotiable in

You can print new fiat money. The tried and true ways are: - Make loans that with less than 100% reserve backing (be a bank) - Print up your own negotiable instruments denominated in an existing currency (sell gift cards) - Create a new currency and hope others accept it (be a central bank)