Monopolistic Pricing in the Banking Industry: a Dynamic Model



We split the right-end side in different pieces, to begin with net worth.

(1 - q) [yYβ - [1 - (1 - q)«]]

Yy β

Yy


« (1 - q )


+1


βγγ + [(1 - q )«


1]


(1 - q ) [yY β - [1 - (1 - q ) «


NW +


« (1 - q )


NW


(74)


The value of Zt is:


[1 - γγ ] γγ - 1] NW

Yy β


(1 - q){yYβ - [1 - (1 - q)«]}

Yy β


Yy              1 - (1 - q ) «


1 - «(1 - q) (1 - q) [yYβ - [1 - (1 - q)«]]


⅛]


Zt +


,__1 - (1 - q )«_________E [1 z ]

(1 - q)[yYβ - [1 - (1 - q)«]]   -α t+1-∣


-1E [1 ] Zt + 1   (1 q ) « E [1 Zt].

β L a J          γγ β      L α J


The value of Xt is:


(1 - q) [yYβ - [1 - (1 - q)«]]
Yy β

_    Yy__Yy β______χ +

1 - «(1 - q) [yYβ - [1 - (1 - q)«]] t-1

I γγβ V, I 1 V. —

[yYβ - [1 - (1 - q)«]]       1 - «(1 - q)


(1 - q)( Yy β - 1)
Yy β


Xt +


(1 - q ) Yy ( D

1 - «(1 - q)( t


The final result is the following:

e[Ft+i] - [—- + γγ] Ft + -Ft~ι =
Lγγβ     J β


[1 - Yy ] [βYγ - 1]


-1E[ 1] Zt + 1 - (1 - q>« E[t Zt +1] + (1 - q)(γγβ - 1> Xt +
β L α J         γγ β      La J         γγ β


Yy β

(1 - q ) Yy

[1 - «(1 - q)]


NW +


(eD - et ).


(75)


Alternative solution of the system


E [ Ft] =


1 - (1 - q)*    , (1 - q) [yYβ - [1 - (1 - q)«]] ,

γγ β   -t +---------Yββ---------Dt +


+βγγ + [(1 - q ) «
Yy β


1 NW + (1 - q) Xt + 1 (1  q) « E [1 Zt +1].

Yy β      La J


(76)


25




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