"Gary Drescher" wrote in message
news:Zb6vc.38159$Ly.15351@attbi_s01...

Any group we care to delineate is "distinct" in some respect or other
(including the arbitrarily delineated group in my analogy).


In what meaningful way are you and your relatives distinct from other subway
riders?



How does the
degree of "distinctness" of a given group bear on the question of whether
marginal cost is the the right measure to use when assessing fees for that
group?


Nobody should be required to pay for things they do not use.



It seems to me that you're arbitrarily requiring the group to be very
"distinct" just because that gives the answer you want to arrive at
regarding GA fees.


I'm not requiring them to be distinct, they simply are distinct. Do you not
agree? Does a Cessna 172 have the same runway needs as a Boeing 747?



The wider public, which does not share our incentive to
invent reasons to keep GA fees low, will not be persuaded that the degree
of
the group's distinctness is relevant.


We're not inventing them, were simply pointing them out. I think the wider
public can see the difference. It's easy to put it in terms the non-flying
public understands. Most of them operate motor vehicles. How many Toyota
drivers believe they should pay the same fees as Peterbuilt operators?