http://business.financialpost.com/20...-by-the-pound/
http://brage.bibsys.no/hsf/retrieve/...hatta_PAYW.pdf
"
Under the current charging policy of airlines, fares are set regardless of weight and size of passengers. Marginal cost theory implies that the average fare seldom reflects the actual cost of flying a passenger because it does not take into account a passenger’s weight or the space taken up. Fares based on PAYW principles may be more efficient because passengers pay according to the fuel they use and the space they take up in a plane. Charging according to weight and space is a widely accepted principle in many other industries, but has met with public opposition in the context of air travel."
It would be interesting if health care worked this way as well, wouldn't it?