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＜departmental bulletin paper＞
The Effect of BSE Occurrence on US Market Power in Beef Exports

Creator	Creator Name 周, 思彤 Zhou, Sitong Affiliation Affiliation Name 元九州大学大学院生物資源環境科学府農業資源経済学専攻食料経済分析学分野
	Author PID K006064 Creator Name 髙橋, 昂也 Takahashi, Kohya タカハシ, コウヤ Affiliation Affiliation Name 九州大学大学院農学研究院農業資源経済学部門 Department of Agricultural and Resource Economics, Faculty of Agriculture, Kyushu University
	Author PID K001624 Creator Name 前田, 幸嗣 Maeda, Koshi マエダ, コウシ Affiliation Affiliation Name 九州大学大学院農学研究院農業資源経済学部門 Department of Agricultural and Resource Economics, Faculty of Agriculture, Kyushu University
Language	Japanese
Publisher	九州大学大学院農学研究院
Publisher	Faculty of Agriculture, Kyushu University
Date	2021-03-01
Source Title	Science bulletin of the Faculty of Agriculture, Kyushu University
Vol	76
Issue	1
First Page	7
Last Page	14
Publication Type	Version of Record
Access Rights	open access
JaLC DOI	https://doi.org/10.15017/4369985

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PISSN	1347-0159
NCID	AA11577672
Record ID	4369985
Subject Terms	米国産牛肉
	BSE
	ローリングウィンドウ法
	市場支配力
	残余需要モデル
	BSE
	Market power
	Residual demand model
	Rolling window method
	US beef
Notes	2003 年12 月に米国で発生した牛海綿状脳症（BSE）は，米国産牛肉の輸出量を大きく減少させた．その後，米国産牛肉の輸出量は2011 年までに回復した一方，利潤を得る上で重要となる市場支配力がどのように変化してきたかは明らかではない．本研究では，BSE の発生が米国の牛肉輸出における市場支配力に与えた影響について，計量経済学的に分析を行う．市場支配力の程度の計測には残余需要モデルを使用するとともに，その時系列変化を明らかにするためにローリングウィンドウ法を使用する．主な分析結果は，以下のとおりである．第1 に，1990 年から2017 年の全サンプルを用いた推計から，平均で見ると，米国は有意な市場支配力を有していた．第2 に，ローリングウィンドウ法を用いた推計から，米国の市場支配力は，BSE 発生後に急激に弱まったものの，BSE 発生前の輸出量を回復し始めた頃から上昇し始め，現在はBSE 発生前よりも高い水準で推移している．
Notes	The outbreak of bovine spongiform encephalopathy (BSE) in the US in December 2003 dramatically decreased the quantity of US beef exports. After the outbreak, US beef exports were able to recover their pre-outbreak value only by 2011. However, the change in US beef exports’ market power, which is an important factor in generating profits, is unclear. This study econometrically investigates how the BSE outbreak affected US market power in beef exports to the global market. The residual demand model is used to measure the degree of market power and the rolling windows estimation method to clarify its time-series variation. The main results of the analysis are as follows. First, the full sample estimation shows that US beef exports had, on the whole, significant market power from 1990 to 2017. Second, the results of the rolling windows estimation indicate that despite a dramatic weakening after the BSE outbreak, the market power of US beef exports began to increase again once exports regained their pre-outbreak level. In addition, the current degree of market power is greater than that before the BSE outbreak.
Created Date	2021.03.12
Modified Date	2022.11.11