Selasa, 14 Mei 2013
Review About Private and External Cost
Why do the two methods so diverge? Economists are n
ot so amoral as to consider it
irrelevant that someone has tragically died. But me
asures of private costs borne by
drink drivers are only economically meaningful if o
ffset by the consumption benefits
enjoyed by all drinkers who took similar risk and d
id not have an accident.
Consider, by analogy, skiing, which would be utterl
y socially wasteful if we counted
all of the accident costs suffered by skiers while
taking no consideration of that all
skiers derive at least some enjoyment from their ri
sky activity. And here, from an
economic perspective, the public health literature
goes seriously awry.
6
BERL simply assumes that harmful drinkers enjoy no
benefits from their
consumption;
7
they consequently deem all private costs as social
ly relevant because
there are no offsetting private benefits. CL take a
rhetorically different but
substantially equivalent approach by assuming any p
otential market failure in alcohol
consumption sufficient reason for dismissing all pr
ivate consumption benefits.
8
Market failures such as imperfect information can r
esult in excess consumption, and
the excess of costs over benefits for the erroneous
ly consumed alcohol can then count
as social, but simply assuming away all private ben
efits because of the potential for
market failure is completely at odds with standard
economic method. We could
similarly assume that imperfect information in the
used car market means nobody
derives any benefit from buying a vehicle.
This substantial difference results in the biggest
divergence between the public health
and the economic approach to tabulating the costs o
f alcohol use. Where public health
figures include all of the costs drinkers impose up
on themselves, the economic
method would either leave those costs to the side o
r incorporate them only if
offsetting private benefits were simultaneously est
imated and included.
Drink-driving costs falling upon those external to
the vehicle should be counted as
policy-relevant from both an economic and a public
health perspective. From an
economic perspective, costs falling upon the driver
should be deemed private and
irrelevant for policy unless weight is given to ben
efits enjoyed by the set of drivers
taking similar risk but who suffer no adverse outco
me.
Whether those inside the vehicle with the drinker b
ear public or private costs is less
clear. A strict interpretation of the economic appr
oach would hold that passengers’
agreement to ride with an intoxicated driver makes
them party to the driver’s
decision; resultant costs or benefits they bear can
then hardly be deemed external.
9
If
we wished to take a less strict line, we would agai
n wish to count the benefits enjoyed
by the passengers of drink drivers who do not suffe
r accidents against the costs falling
on those who do.
It is easy to scoff at the potential existence of s
uch benefits, but it puts a heavy thumb
on the scale if we simply assume them away. In any
case, the mortality costs of drink
driving accidents falling on those inside the drink
er’s vehicle other than the driver are
a small proportion of overall tabulated mortality c
osts.
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