Named in honour of Australian conservative politician, Brendan Nelson -
"As a debate about the economy continues, the probability of the increasing price of petrol at the bowser being mentioned by a non-government politician approaches one."
It is considered a disingenuous debating technique, analogous to Godwin's Law, unless the person mentioning the price of petrol is actually proposing a genuine alternative.
COROLLARY: Athenasi's Observation - the gap between a political discussion commencing and Nelson's Law being demonstrated decreases over time.
Ending every media release with a disingenuous reference to the cost of "getting petrol into the car" is an example of Nelson's Law.