今日講義目的匯總課件

1、 Oligopoly Theory 7. Spatial Competition in Mixed Oligopoly 今日講義目的（）混合寡占文脈Spatial Competition Model e再確認（）Spatial Competition 文脈混合寡占特徴再確認OT:Mixed Oligopoly1 Oligopoly Theory 7. Spatial Outline of the 7th Lecture7-1 Shopping Model in Mixed Duopoly7-2 Endogenous Cost Differentials in Mixed Duopoly 7-3

2、 Local Public Firm and Equilibrium Location7-4 Elastic Demand and Equilibrium Location in Mixed Duopoly 7-5 Shipping Model in Mixed Oligopoly7-6 Foreign Competition and Differentiation 7-7 Location Equilibrium in Quasi-Linear CityOT:Mixed Oligopoly2Outline of the 7th Lecture7-1 Shopping ModelOT:Mixe

3、d Oligopoly3Shopping ModelOT:Mixed OligopoShopping Model in Mixed DuopolyDuopoly Model、長直線都市。公企業(yè)（企業(yè)）。私企業(yè)（企業(yè)）。私企業(yè)國內企業(yè)。移動費用距離乗比例。各消費者単位財企業(yè)企業(yè)購入。企業(yè)利得総余剰、企業(yè)利得自社利潤。両企業(yè)限界費用一定（費用格差）。各企業(yè)第期獨立立地決 。立地見後第期Bertrand競爭。shopping modelOT:Mixed Oligopoly4Shopping Model in Mixed DuopolMaximal Differentiation in Private

4、 Duopoly企業(yè)立地企業(yè)立地OT:Mixed Oligopoly5Maximal Differentiation in PriWhy Maximal Differentiation in Private Duopoly?企業(yè)少離（）企業(yè)需要価格弾力性小企業(yè)価格上（直接効果）（）企業(yè)需要価格弾力性小企業(yè)価格上企業(yè)最適価格上（間接効果、戦略的効果）効果離誘因生Hotelling示需要量減少効果dominate最大距離均衡生OT:Mixed Oligopoly6Why Maximal Differentiation inMixed Duopoly公企業(yè)自分需要分割効率的配慮問題：Second S

5、tage競爭考（立地所與）。私企業(yè)（企業(yè)）価格P2所與公企業(yè)最適価格？（最適反応？） OT:Mixed Oligopoly7Mixed Duopoly公企業(yè)自分需要分割脫線：私企業(yè)外國企業(yè)？問題：Second Stage競爭考（立地所與）。海外私企業(yè)（企業(yè)）価格P2所與公企業(yè)最適価格？（最適反応？）OT:Mixed Oligopoly8脫線：私企業(yè)外國企業(yè)？問題：Second StagMixed DuopolyFirst Stage企業(yè)離（）企業(yè)需要価格弾力性小企業(yè)価格上 Private Duopoly存在直接効果消（）企業(yè)需要価格弾力性小企業(yè)価格上企業(yè)最適価格上（間接効果、戦略的効果）Pri

6、vate Duopoly比離誘因小OT:Mixed Oligopoly9Mixed DuopolyFirst StageOT:MixEfficient Differentiation in Mixed DuopolyCremer et al (1991)企業(yè)立地企業(yè)立地3/41/4OT:Mixed Oligopoly10Efficient Differentiation in MEndogenous Cost Differentials between Public and Private Firms Matsumura and Matsushima (2004)設定生産費用內生化以外Crem

7、er et al (1991)Duopoly version同。Hotelling, Shopping Model, Domestic Private Firm (Firm 2), Public Firm (Firm 1) 企業(yè)費用內生化：企業(yè)努力費用下。努力disutility伴（）費用削減努力（）立地選択（）価格競爭OT:Mixed Oligopoly11Endogenous Cost Differentials Maximal Differentiation in Private Duopoly at the second stage企業(yè)立地企業(yè)立地費用given極端費用格差限均衡立地費

8、用格差時同費用格差？純粋戦略均衡無（第講參照）OT:Mixed Oligopoly12Maximal Differentiation in PriMixed DuopolyThird Stage 公企業(yè)自分需要分割効率的配慮問題：Third Stage競爭考（立地所與）。仮c1c2。私企業(yè)（企業(yè)）価格P2所與公企業(yè)最適価格？（最適反応？） P1= P2, P1 P2, P1c2。効率的立地？（均衡立地限）X1= 1/4, X1 1/4, X1 3/4, X2 3/4 OT:Mixed Oligopoly14Mixed Duopoly Second Stage OT:Efficient and

9、Equilibrium Differentiation in Mixed Duopoly at the second stage企業(yè)立地企業(yè)立地費用givenfirst bestoutcome実現均衡立地性質費用格差時同OT:Mixed Oligopoly15Efficient and Equilibrium DiffFirst stage in Private Duopoly 両私企業(yè)努力過小。企業(yè)費用下企業(yè)価格下企業(yè)価格下（戦略的補完）企業(yè)損失OT:Mixed Oligopoly16First stage in Private DuopolyFirst Stage in Mixed Duo

10、poly 私企業(yè)努力過大公企業(yè)私企業(yè)間費用格差生。企業(yè)費用下企業(yè)端立地(second stage)、高価格(third stage)効率的企業(yè)市場譲企業(yè)利益戦略的理由多（過大）投資誘因公企業(yè)民営化厚生改善可能性OT:Mixed Oligopoly17First Stage in Mixed Duopoly 私脫線：Kitahara and Matsumura (unplublished)公企業(yè)立地私企業(yè)立地3/41/4linear city, mill pricing, elastic demand, constant marginal cost, no cost asymmetry, qua

11、dratic transport inefficient location (too close,私企業(yè)少離Welfare改善) OT:Mixed Oligopoly18脫線：Kitahara and Matsumura (unpLocal Public Firm in Mixed DuopolyInoue et al (2009)企業(yè)Local Public Firm。企業(yè)域外私企業(yè)。以外Cremer et al (1991)同設定。OT:Mixed Oligopoly19Local Public Firm in Mixed DuoLocal Public Firm1/2域內域外OT:Mix

12、ed Oligopoly20Local Public Firm1/2域內域外OT:MBehavior of Local Public Firm 実質外國企業(yè) more aggressive。域外消費者高売。価格差別出來。less aggressiveOT:Mixed Oligopoly21Behavior of Local Public Firm Behavior of Local Public Firm 実質外國企業(yè) more aggressive。域外消費者高売。価格差別出來。less aggressiveOT:Mixed Oligopoly22Behavior of Local Publ

13、ic Firm Results （）Multiple Equilibria均衡：公企業(yè)域內真中、私企業(yè)域外端立地均衡：公企業(yè)域內右端、私企業(yè)域內端立地（）均衡Payoff Dominant（）全體（域內）余剰均衡大OT:Mixed Oligopoly23Results （）Multiple Equilibria均衡1/2域內域外1/4公企業(yè)立地私企業(yè)立地OT:Mixed Oligopoly24均衡1/2域內域外1/4公企業(yè)立地私企業(yè)立地OT:均衡1/2域內域外1/4公企業(yè)立地私企業(yè)立地OT:Mixed Oligopoly25均衡1/2域內域外1/4公企業(yè)立地私企業(yè)立地OT:Intuition

14、behind multiple equilibria 私企業(yè)best response私企業(yè)競爭避遠立地（私企業(yè)域外企業(yè)依存）公企業(yè)域外消費者抱less aggressive私企業(yè)域內（）立地 公企業(yè)距離十分出來遠、。公企業(yè)best response私企業(yè)域外立地域內消費者transport cost減域內中心近。私企業(yè)域內立地高価格域外消費者稼境界近。OT:Mixed Oligopoly26Intuition behind multiple equi各均衡性質 均衡：比較的高価格両企業(yè)利得大。域外消費者犠牲上高利得。全體余剰均衡小。OT:Mixed Oligopoly27各均衡性質 均衡：比

15、較的高価格両企業(yè)利得大。Shipping Model in Mixed Oligopoly OT:Mixed Oligopoly28Shipping Model in Mixed OligopShipping Model in Mixed Oligopoly Matsushima and Matsumura (2003)Oligopoly Model、長円環(huán)都市。各點線形需要関數。輸送費用距離比例。限界費用一定。企業(yè)利得総余剰、私企業(yè)利得自社利潤。各企業(yè)第期獨立直線都市上立地決 。立地見後第期期Cournot競爭。shipping modelPal (1998)mixed oligopoly

16、versionOT:Mixed Oligopoly29Shipping Model in Mixed OligopEquilibrium Location (Duopoly)一般性失企業(yè)立地企業(yè)最適反応考OT:Mixed Oligopoly30Equilibrium Location (Duopoly)Equilibrium Location (Duopoly)一般性失企業(yè)立地企業(yè)均衡立地OT:Mixed Oligopoly31Equilibrium Location (Duopoly)Equilibrium Location (Oligopoly)一般性失企業(yè)立地私企業(yè)集積OT:Mixed

17、Oligopoly32Equilibrium Location (OligopolLinear City？公企業(yè)立地私企業(yè)立地私企業(yè)立地OT:Mixed Oligopoly33Linear City？公企業(yè)立地私企業(yè)立地私企Linear City？公企業(yè)立地私企業(yè)立地OT:Mixed Oligopoly34Linear City？公企業(yè)立地私企業(yè)立地OT外國企業(yè)？Matsushima and Matsumura (2006)Matsushima and Matsumura (2003)私企業(yè)何社外國企業(yè)？OT:Mixed Oligopoly35外國企業(yè)？Matsushima and Matsu

18、Equilibrium Location(外國企業(yè)社)一般性失企業(yè)立地私企業(yè)集積外國企業(yè)OT:Mixed Oligopoly36Equilibrium Location(外國企業(yè)社)一般Equilibrium Location(外國企業(yè)社)一般性失企業(yè)立地國內私企業(yè)戦略変外國企業(yè)OT:Mixed Oligopoly37Equilibrium Location(外國企業(yè)社)一般Equilibrium Location(外國企業(yè)社)一般性失企業(yè)立地外國企業(yè)間differentiationOT:Mixed Oligopoly38Equilibrium Location(外國企業(yè)社)一般General Model of Linear and Circular City01/2跨時費用Circular, 十分大Linear。最初本質的同。OT:Mixed Oligopoly39General Model of Linear and CiMa