Analyzing Collusion Using Set-Identified Marginal Cost Functions

Mizuta, Seiichiro; Nishiwaki, Masato

Discussion Papers In Economics And Business, 2025, 25-03, 1-44

アクセス数:29件（2025-06-30 13:20 集計）

固定URL: https://hdl.handle.net/11094/101387

論文情報

ファイル出力 EndNote Basic出力 Mendeley出力

タイトル
Analyzing Collusion Using Set-Identified Marginal Cost Functions
著者
NRID
1000010962962 1000010962962
著者名
Mizuta, Seiichiro
NRID
1000080599259 1000080599259
researchmap permalink
7000007426 7000007426
Scopus Author ID
55796446500 55796446500
著者名
Nishiwaki, Masato
キーワード等
collusion
set identification
marginal cost functions
interval regression
JEL分類コード (JEL)
C57
L40
抄録
We propose an approach for analyzing markets in which firms are (suspected of) colluding. Our approach, which is based on set-identified marginal cost functions, enables us to screen for collusion and measure potential welfare losses caused by non-competitive behavior. The key idea is to exploit supernumerary (or excluded) instrumental variables that provide moment restrictions to falsify hypotheses about firm conduct and eliminate cost parameters implied by the falsified hypotheses. The resulting set of cost parameters that remain unfalsified under these restrictions functions as a screening tool for collusion. When competitive behavior is falsified, the corresponding parameter is excluded from the identified set. Additionally, the identified set can be used to measure potential welfare losses when competitive behavior is ruled out. This type of counterfactual welfare analysis is otherwise extremely difficult or nearly impossible to conduct.
出版者
Graduate School of Economics, The University of Osaka
収録物名
Discussion Papers In Economics And Business
巻(号)
25-03
ページ
1-44
刊行年月
2025-05
言語
英語
ハンドルURL
https://hdl.handle.net/11094/101387
関連情報 (references)
URI
https://www2.econ.osaka-u.ac.jp/econ_society/dp/2503.pdf
アクセス権
metadata only access
カテゴリ
ディスカッション／ワーキング・ペーパー DP/WP
Discussion Papers In Economics And Business