| None of this will matter once everything is digitized and it's all ephemerally available on demand for some micropayment. |
| The market and the authorities have combined to assure the virtually frictionless conversion of Treasuries into payment money on demand. |
| Like other types of bills of exchange payable on demand, a cheque has to be presented for payment within a reasonable time. |
| It continually adjusts to the owner's driving preferences, tuning itself to provide more power on demand for better fuel economy. |
| But with personal property creatable on demand from sunlight and dirt, it's not clear what the medium of exchange would be. |
| With the luxury of push-button devices, DJs and truck-borne musicians increased music speed on demand or at will. |
