Research Discussion Paper – 1974
Equation (A.54)
Δ
X
N
=
(
f
+
h
)
W
E
•
−
(
f
+
g
+
h
+
i
)
P
N
•
+
(
g
+
i
)
P
T
•
−
j
Q
•
+
h
t
P
•
+
f
t
Y
•
−
h
t
I
•
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