6. *Calculating PED of public transport: Transperth ticket prices were reported to have increased by about 10% (or twice the rate of inflation) between the 2012/13 and 2014/15 financial years. Over the same period, the number of train journeys fell by more than half a million, from 27,883,067 to 27,143,328. Does this suggest Perth commuters were price-sensitive? How might public transport companies use this information?.