Qualification-Mismatch and Long-Term Unemployment in a Growth-Matching Model



• ʌ

Equate the last equations and use (23) and E = E = 0, then

~ ʌ '

ββ = _2»_ fc« _ (l±ni>∆k

= Φι(k)


C,0Λ^            s

is implied. ■

Proposition 7 The balanced accumulation function is a concave function with Φι(0)


= 0. Φι() = _'x..Φ∣ (0) = . Φ'ι() = 5,Φi(k)


and Φ1(k) < 0.


(≥ 0

I <0


for aka 1 {


a5


< a5


ʌ

Proof. Rewrite (24) as Φ4(k) = α4 [k“ ± a5k] with a4 := Xq/cvqXv and a5 : =
(1 ±
c∕s) Л/s, then Φχ(0) = 0. Φι() = -∞. Differentiate Φ4(k) w.r.t. k, then

and therefore


Φ'1(k)


(≥0

I <0


for


aka 1


≥ α5

< a5


Iim Φ1 (k) = Iim (ak“ 1 — a5) = ∞
fc→0               fc→0 v              ,

Iim Φ1(k) = Iim (ak“_ 1 — a5) = _a5.
fc→∞            fc→∞ `

Furthermore,

Φι(k) = (« _ 1) aa4k“-2 < 0

is implied. ■

Proposition 8 Suppose n — 2λ > 0. then < 0.

Proof. Take the derivative of (21) w.r.t. Λ and use n — 2Λ > 0, then


5Φι(k)


. . , , . . ʌ -,
(1
_ α)(1 _ £)(1 _ ω) Λo n _ 2Λ ± ɪkɑ"1


k“


ʌ

∂Λ


c 2 Г c ,      ,

cυ0λ  n _ λ ± -ɪk" 1


is implied. ■


31




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