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International monetary policy coordination in a new Keynesian model with NICE features

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Academic year: 2021

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S

 1  1 

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2  R 1  D

q

) (y * y ) ( * 3 2q y y CC    . 2  2

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    e * q ) (y * y 3

t t t t t r e e r  *  ( 1)  ) ( ) ( t 1 t t PPP t ee  ee

) (e t ePPP

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PPP e    *     PPP e     e * q 𝐴𝐷 ∶ ) 1 ( ) 1 ( 1 1 2 3 1 3 2 1 1 1 3 2 1 2 * 3                             y q D R y , 𝐴𝐷∗ ) 1 ( ) 1 ( 1 1 2 3 * 1 * * 3 2 1 1 1 3 2 1 2 3 *                             y q D R y .

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2

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𝜋 = − 1 𝜒𝛽𝑦 𝜒 𝛽 ∂ − ∂y= ( ) −1, ∂ 1% − ∂y 𝜒 𝛽

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y = −χβπ

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𝑟𝑜𝑝𝑡′ 𝑟𝑜𝑝𝑡′′

𝑟𝑜𝑝𝑡 𝑟𝑜𝑝𝑡

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*

2 2 2 2 *) ( 4 *) ( 4 1 ) ( 4 ) ( 4 1 2 1        L L y y LW

 

y y y y       *  * *

 

* * * y y y y        3 3 1 * *          y y y y

0 1 1 2 3 3                      y y    1

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Debortoli D., J. Kim, J. Lindé and R. Nunes. 2017. Designing a Simple Loss Function for Central Banks: Does a Dual Mandate Make Sense? IMF working

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D y y q r y 1 2 3( * ) R y r12  S y      * * 3 2 * 1 * ) (y y D q r y      * * 2 * 1 * R y r     * * * S y          e * q

*

1 r r q    D y q r y         3 * 3 3 3 2 3 1 1 1 1 1 1         2 2 2 2 1  y L S y      * 3 3 3 3 2 * 3 1 * 1 1 1 1 1 r q y D y                  2 * 2 * * 2 2 1  y L * * * S y     

*

1 r r q       e * q

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rA* B* 2 1 2 1 C B 2 1 2 1 B* C A* B A y AD’ yB yA PC yA* πB AD*’ π π* y* yC AD A* IS* r r* MP* A yA IS MP y MP’ rA IS’ yC IS*’ MP*’ *’ PC* AD* AD’’ πA πC πA* yB* πB* yB MP’’ rB rC y* yB* yA* rB*

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2 1 rA* B* 2 1 2 1 C B 2 1 2 1 B* B A* C A y AD’ yB yA PC yA* πB AD*’ π π* y* yC AD A* IS* r r* MP* A yA MP y MP’ rA yC IS*’ MP*’ PC* AD* AD’’ πA πC πA* yB* πB* yB MP’’ rB rC y* yB* yA* rB* IS IS’ IS’’

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rA* B* 2 1 2 1 C B 2 1 B* C A* B A y AD’ yB yA PC yA* πB AD*’ π π* y* yC AD A* IS* r r* MP* A yA IS MP y MP’ rA IS’ yC IS*’ MP*’ PC* AD* πA πC πA* yB* πB* yB MP’’ rB rC y* yB* yA* rB* PC’

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1 2 1 B*’ A*’ B C’ A A* A y π* y* y r r* yA π πA r opt r’’ opt r’ opt IS IS’’ IS’ rB y*A y* rC rA r*B r*A r* opt r*’ opt IS* IS*’ PC PC* πA*

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PC* PC PC’ LB B B*’ A*’ B C’ A A* A y π* y* y r r* yA π πA r opt r’’ opt r’ opt IS rB y*A y* rC rA r*B r*A r* opt r*’ opt IS* IS*’ πB yB IS’

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