JEL Classification D43
"Oligopoly and Other Forms of Market Imperfection"
These are all the papers that have a JEL assignment (not all authors have given JEL codes to their papers) and that include the D43 classification. (sorted by date)
Becker, Bo, and Todd Milbourn, " How did Increased Competition Affect Credit Ratings?", Journal of Financial Economics, Vol. 101, No. 3, (September 2011), pp. 493-514.
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