Find the elasticity of scale and the elasticity of substitution for the CES production function: 1 ƒ(x₁, x₂) = (x³ + x³)³. Solution: We first calculate the marginal products: 1 2 1 4. - ³ ( 4 + x² ) ( x ²) - ( 4² + x²) x, ** fx₁ -2/3 x1 2 1 - ³ (x ² + x²) * (1 x 5²³) = ( x² + x²) x² fx₂= 3 -2/3 x₂

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter9: Production Functions
Section: Chapter Questions
Problem 9.7P
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Find the elasticity of scale and the elasticity of substitution for the CES production function:
1
1
f(x₁, x₂) = (x³ + x2)³.
Solution:
We first calculate the marginal products:
2
fx₁
= 3 +
=
x1fx1
-+
2
2
10 - ² ( x² + x ) ( + x^²) = ( + + + + ² ) 15 ²0
x²
-2/3
x₂
+
x2fxz
Elasticity of scale = _1₁_+_*__*(+)´<°¸«d«)*;»_
f(x1,
f(x1,
‹2)²
=
-2/3
r2/3 = TRS = t (where TRS = =t).
⇒ r = t³/² ⇒ ln(r) = ln (t) and o =
-2/3
dln (r)
dln (t)
To get elasticity of substitution, we first need TRS and denote r =
1
x3 X1
TMS - F (+4+2)0
=
fx₁
fx₂
2
1
+ x²) x₂²
MIN
x2
3
-2/3
(x²
-2/3
2
2/3
2/3
x1
-2/3
= r²/3
x¹/3
+
1/3
= 1.
Transcribed Image Text:Find the elasticity of scale and the elasticity of substitution for the CES production function: 1 1 f(x₁, x₂) = (x³ + x2)³. Solution: We first calculate the marginal products: 2 fx₁ = 3 + = x1fx1 -+ 2 2 10 - ² ( x² + x ) ( + x^²) = ( + + + + ² ) 15 ²0 x² -2/3 x₂ + x2fxz Elasticity of scale = _1₁_+_*__*(+)´<°¸«d«)*;»_ f(x1, f(x1, ‹2)² = -2/3 r2/3 = TRS = t (where TRS = =t). ⇒ r = t³/² ⇒ ln(r) = ln (t) and o = -2/3 dln (r) dln (t) To get elasticity of substitution, we first need TRS and denote r = 1 x3 X1 TMS - F (+4+2)0 = fx₁ fx₂ 2 1 + x²) x₂² MIN x2 3 -2/3 (x² -2/3 2 2/3 2/3 x1 -2/3 = r²/3 x¹/3 + 1/3 = 1.
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