Circulating money faster has an effect similar to circulating more money. Digital cash used on a large scale will further accelerate money's velocity. Money that is composed of gold, precious materials, or paper comes in fixed units that are paid at fixed times. You pay the phone company once a month even though you use the phone everyday. This is batch-mode money.
Electronic money is continuous-flow.
Payment coincides with use. Together with its higher velocity, continuous electronic money can approach near instantaneity. Finally, really plastic money. Once completely disembodied, digitized money escapes from a single transmission form and merrily migrates to whatever medium is handiest. Separate billing fades away.