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Differentiated mixed duopoly and decentralization in a two‐city model

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  • Kosuke Oshima

Abstract

We investigate a differentiated mixed duopoly with two cities where a public firm and a private firm are located in different cities. We find that in most cases the privatization level is higher under centralization (the national or regional government owns the public firm) than under decentralization (a city government owns the public firm). In particular, under decentralization, the public firm is fully owned by the city government if the substitutability of differentiated goods is relatively high. While the social welfare is higher under centralization, the welfare of the city with the public firm is higher under decentralization in most cases. Se investigó un duopolio mixto diferenciado de dos ciudades en el que una empresa pública y una empresa privada están ubicadas en ciudades diferentes. Se encontró que, en la mayoría de los casos, el nivel de privatización es mayor si hay centralización (el gobierno nacional o regional es el propietario de la empresa pública) que si hay descentralización (el gobierno de una ciudad es propietario de la empresa pública). En particular, bajo la descentralización, la empresa pública es propiedad exclusiva del gobierno de la ciudad si la sustituibilidad de bienes diferenciados es relativamente alta. Mientras que el bienestar social es mayor bajo la centralización, el bienestar de la ciudad con la empresa pública es mayor bajo la descentralización, en la mayoría de los casos. 本稿では、公的企業と民間企業が2つの別々の都市に立地している2つの都市における、差別化された、2つの都市での複占状態を検討する。ほとんどの場合において、地方分散化(公的企業が市のものである)よりも集中化(公的企業が国家または地方行政のものである)の方が、民営化のレベルが高いことがわかる。特に地方分散化では、差別化された商品の代替可能性が相対的に高いい場合、公的企業は完全に市が所有するものである。集中化の条件下では社会福祉のレベルが高い一方で、ほとんどの場合においては地方分散化の条件下では市による公的企業の福祉レベルが高い。

Suggested Citation

  • Kosuke Oshima, 2018. "Differentiated mixed duopoly and decentralization in a two‐city model," Papers in Regional Science, Wiley Blackwell, vol. 97(4), pages 1425-1440, November.
  • Handle: RePEc:bla:presci:v:97:y:2018:i:4:p:1425-1440
    DOI: 10.1111/pirs.12307
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