11
The consumer’s maximisation problem gives rise to the following demand
functions:
α0Y d
C = C + α1Y-
pC
α α O0Yd
ι = ι+——
w
H - H' + ∑ β1mAm tYr.,
MED =m +α3Y
β2 pMED
with
Z Ч _ H - H * + ∑ β, mA
Yd = w I T-∑θ,A, 1 + P - PcC - wl - Pmed--------m-----
∖ m J β2
(6)
(7)
(8)
(9)
Yd is the disposable income that can be allocated to the consumption of C, l and MED. A
higher level of air pollution increases the demand for medical care, through equation (3)
Secondly, it has a downward impact on the consumption of C, l and MED because it
diminishes disposable income Yd in two ways: it increases the subsistence level of
medical consumption and it reduces total available time.
At the lower level of the nested LES function, C is allocated over twelve
commodities (excl. medical care), as in the standard GEM-E3 model. The consumer is
assumed to maximise
12 / —
C=∑αi1ln(xi-xi
i =1
(10)
in which xi stands for the consumption of commodity i and xi is the subsistence level.
This subutility function is maximised subject to the budget constraint
12
∑pixi≤ YC
i=1
(11)
which states that spending allocated to commodities 1 to 12 cannot exceed the budget
allocated to C (YC=pC.C).
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