Brad Olsen: Infometrics principal economist on the pre-Christmas fall in the cost of petrol - Heather du Plessis-Allan Drive

Good news for Kiwi motorists, with a pre-Christmas fall in petrol prices.

Brent Crude has fallen from $81 US dollars on Friday to $77 this morning.

The average price for unleaded 91 petrol has already fallen about five percent since the start of the month.

Infometrics principal economist Brad Olsen explains this sudden shift.

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