From OrganicDesign Wiki
In the example above of travelling from A to B, we may have a few different routes to choose from, and it's not only the time they each take that we base our decision on, it's the cost! When we asses the cost of each route and compare them, we are actually assessing the energy that each one consumes. This energy comes in many forms such as physical exertion, bus fares or the effort of convincing a friend to drive us to B.
In the network it's only the changes to information which need to be propagated from A to B, there's no point expending energy to tell a node something it already knows (we don't want to make it completely like real life!). Propagation of change is the way of our own space-time too, that's why things travelling in space keep moving at the same speed and direction forever if no force is applied to them. The amount of information undergoing change within a given time is called bandwidth, which is the energy aspect of the network.
Bandwidth is considered to be the common currency of the network, it's the measuring stick by which all efficiency is assessed, and the terms currency and cost are used in this context just as in everyday life.
In the network, energy can appear in many different forms just like our own assessment of the energy of travelling routes also involved different forms of energy. But because everything inside the space-time is derived from Moment, including all the forms of energy, the network can always reduce diverse energy forms down to the common terms of bandwidth to compare costs of various tasks.
