"Steven P. McNicoll" wrote in message
ink.net...

What is your share of services? What do you feel is the marginal cost of
providing services to you?

Why is the marginal cost what's relevant (rather than a pro rata share of
the total cost)? If I fly on an airliner, or I step onto a bus or subway,
the marginal cost of my presence (in terms of the extra energy expenditure)
is a negligible fraction of the fare. Should I therefore expect to be
transported nearly for free?

--Gary