Generalised Time
If the monetary cost of the journey (p) is considered to be irrelevant for the purposes of the exercise (for example, when comparing different journey options through a public transport network when fares are constant), there is no need to convert the generalised cost to a currency value - instead, it can be left in units of time, as long as all time is equivalent (for example, if all time is converted to in-vehicle time). These units of time may be referred to as generalised time.
Read more about this topic: Generalised Cost
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