Media type: E-Article Title: Internal Versus External Market Conditions and Firm Profitability: An Exploratory Model Contributor: Kessides, Ioannis N. Published: Oxford University Press (OUP), 1990 Published in: The Economic Journal, 100 (1990) 402, Seite 773 Language: Not determined DOI: 10.2307/2233658 ISSN: 0013-0133 Keywords: Economics and Econometrics Origination: Footnote: