[aerohead]

AeroStealth read Jevon's 1865, 'The Coal Question', and what the Chicago School of economics creatures do with it, mischaracterizes what he actually said ( convenient for present fossil-fuel lobbyists, climate deniers, and Americans who don't read.
Nobody ought to use it in conversation without its context.
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Inverted-Rate scales for 'energy' have been adopted in some locals.
Once one consumes some 'reasonable' ( statistical average mean for a family unit ) amount of energy ( let's say electricity ), the 'next' block of kilowatts rises to 'twice' the price.
At each 'doubling' of consumption, the price 'doubles', in a geometric trend, to protect the innocent from the stupidity of the well healed.