When the right side values are measured as deviations from the mean (indicated by
the prefix D) the mean of the dependent left side variable is equal to the constant
element.
Model 1. A fixed Coefficient Model
GY = α0 + a1GI (1)
GI = γ0 + 1d DY (2)
where
a0 - is the autonomous growth rate.
α1 - the investment multiplier
γ0 - is the (general ) investment growth for DY = 0, or MGI
γ1 - indicate the distributions of DFI due to the level of Y
GY = α0 + αι(γo + γι DY) (3)
gy = C⅛ + «1Уо + «171 dy (4)
DGY = α1γ1 DY (5)
β = «171 > 0 for Y1 > 0 (6)
Model 2. The Multiplier is Included
GY = a0 + a1GI (7)
GI = 70 + 71 DY (8)
«1 = «10 - «11DY
GY = aŋ + (аю - anDY)(70 + Ъ DY) (9)
GY = a0 + aw70 + ⅜071dy - O11Y0 dy - ‰Y1dy2 (10)
DGY = aw71DY - auγ0DY - «1171DY2 (11)
Now the distribution of growth on income groups is described by a second degree
polynomial
DGY = («1071 - «1170 )DY - «1171DY2 (12)
22
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