Time Flow Relationships and Self-Destructive Oscillations -continued from Part 1 An ideal industry may be symbolized electronically in various ways. The simplest way is to represent a demand by a voltage and a supply by a current. When this is done, the relationship between the two becomes what is called an admittance, which can result from three economic factors: (1) foresight flow, (2) present flow, and (3) hindsight flow.