Research Discussion Paper – 1974
Equation (A.39)
Δ
X
L
=
−
(
a
+
d
)
W
E
•
+
(
a
−
b
+
d
−
e
)
P
N
•
+
(
b
+
e
)
P
T
•
+
c
Q
•
−
a
t
P
•
−
d
t
Y
•
+
a
t
I
•
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