Modified Keynesian Theory calls for the creation of a commercial bank owned by the federal government. The commercial bank will not be taking deposits from the general public. Instead, the commercial bank will be borrowing reserves straight from the Central bank, the Fed in the USA. In other words, the Fed (or the Central bank) will be printing currency, billions of dollars, and making loans with zero interest rates to the commercial bank. The commercial bank will be making loans to real estate developers. The real estate developers will be investing the money to build new modern cities with modern public transportation, where most of the residents will not even need to own autos. As real estate is built and sold, the real estate developers will be paying back their loans to the commercial bank. The commercial bank will be paying back its own loans to the Fed (the Central bank). In the long run, there will be no increase in inflation. New money will be created as a result of making construction loans. The same amount of money supply will be destroyed when the construction loans are paid back. The end result will be no permanent increase in money supply -- and no increase in inflation in the long run.