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NOTA AMPLIATORIA: FUSIONES HORIZONTALES ENTRE
EMPRESAS DE STACKELBERG
En el modelo de Stackelberg, con L empresas líderes y F seguidoras, hemos determinado que la
fusión de dos seguidoras adicionales para formar una nueva líder, será rentable si se cumple la
condición
0)1()2(2)1()1( 222
 LNLLNL ……… (1)
Ahora, se trata de demostrar que esa condición siempre se cumple. Para ver porqué,
consideremos lo siguiente:
Definimos 1 Lx y 1 LNy . Entonces, se puede deducir que
yxyx 222
)1(2)2(  ……… (2)
yxyyx 222
)1(2)44( 
22
)1(2)
4
4(  x
y
yx
Así expresada la condición (2), necesitamos probar el valor de y que asegure la desigualdad.
La derivada
2
4
1
)
4
4(
ydy
y
yd


es negativa para 20  y y positiva para 2y .
Para que 0y , tenemos 8
2
4
42
4
4 
y
y con igualdad que se cumple sólo cuando
2y . En el marco del análisis de la fusiones horizontales entre seguidoras para formar una
nueva líder, este valor significa que en el mercado deben existir al menos 2 seguidoras que
quieran convertirse en una nueva líder. Primera condición identificada. ¿Qué pasa con x?
Para 1x , reescribimos la inecuación (2)
y
x
x
y
2
2 1
28)2( 




 
 obteniendo yxyx 222
)1(2)2(  que es justamente la inecuación
(2) requerida.
A partir de cualquier configuración industrial de líderes y seguidoras, se cumple que otras dos
seguidoras siempre querrán fusionarse. Es un resultado alentador, pues el modelo de Daughety
(1990) ofrece una solución satisfactoria a la paradoja de la fusión. Queda claro que con 2y y
1x una vez que una empresa se fusiona y se convierte en líder, “las empresas restantes
querrán hacer lo mismo, en lugar de quedarse observando cómo se agotan su producción y
sus utilidades.” Pepall-Richards-Norman (2011;297).

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Ampliación fusiones en stackelberg vf

  • 1. NOTA AMPLIATORIA: FUSIONES HORIZONTALES ENTRE EMPRESAS DE STACKELBERG En el modelo de Stackelberg, con L empresas líderes y F seguidoras, hemos determinado que la fusión de dos seguidoras adicionales para formar una nueva líder, será rentable si se cumple la condición 0)1()2(2)1()1( 222  LNLLNL ……… (1) Ahora, se trata de demostrar que esa condición siempre se cumple. Para ver porqué, consideremos lo siguiente: Definimos 1 Lx y 1 LNy . Entonces, se puede deducir que yxyx 222 )1(2)2(  ……… (2) yxyyx 222 )1(2)44(  22 )1(2) 4 4(  x y yx Así expresada la condición (2), necesitamos probar el valor de y que asegure la desigualdad. La derivada 2 4 1 ) 4 4( ydy y yd   es negativa para 20  y y positiva para 2y . Para que 0y , tenemos 8 2 4 42 4 4  y y con igualdad que se cumple sólo cuando 2y . En el marco del análisis de la fusiones horizontales entre seguidoras para formar una nueva líder, este valor significa que en el mercado deben existir al menos 2 seguidoras que quieran convertirse en una nueva líder. Primera condición identificada. ¿Qué pasa con x? Para 1x , reescribimos la inecuación (2) y x x y 2 2 1 28)2(         obteniendo yxyx 222 )1(2)2(  que es justamente la inecuación (2) requerida. A partir de cualquier configuración industrial de líderes y seguidoras, se cumple que otras dos seguidoras siempre querrán fusionarse. Es un resultado alentador, pues el modelo de Daughety (1990) ofrece una solución satisfactoria a la paradoja de la fusión. Queda claro que con 2y y 1x una vez que una empresa se fusiona y se convierte en líder, “las empresas restantes querrán hacer lo mismo, en lugar de quedarse observando cómo se agotan su producción y sus utilidades.” Pepall-Richards-Norman (2011;297).