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Världshändelsers effekt på oljebolags aktiekurser: Hur effektiv är marknaden?
Södertörn University College, School of Business Studies.
Södertörn University College, School of Business Studies.
2011 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

I denna uppsats undersöks om världshändelser skapar abnorma effekter hos oljebolags aktiekurser och om dessa effekter ter sig olika beroende på företagens olika storlek. Undersökningen utförs med hjälp av en eventstudie som genomförs på sex oljebolag med tre världshändelser som utgångspunkt. De valda världshändelserna bestod av två naturkatastrofer och en större ekonomisk händelse. Företagen som valdes delades in i två grupper om tre företag, där ena gruppen innehöll de större företagen och den andra gruppen de mindre.

Slutsatserna som har kunnat dras av undersökningen är att händelserna i två av de tre undersökta fallen orsakade signifikanta abnorma under- eller överavkastningar hos oljebolagens aktier vilket bevisar en viss ineffektivitet hos marknaden. Det generella utfallet var att den ekonomiska händelsen visade sig ha en större påverkan på aktiekurserna än de två naturkatastroferna hade. Samtidigt kunde det påvisas en större skillnad mellan de större och de mindre företagens aktiekursers reaktioner gällande den ekonomiska händelsen. Resultaten visade att de mindre företagen drabbades hårdare.

Abstract [en]

This essay examines whether world events create abnormal effects of oil companies stock prices and whether these effects appear different depending on the companies’ different sizes. The analysis is performed using an event study conducted in six oil companies with three world events as a starting point. The selected world events consisted of two natural disasters and a greater economic event. The companies selected were divided into two groups of three companies, in which one group contained the larger companies and the second group the smaller ones.

The conclusion that has been drawn from the study is that the events in two of the three cases studied caused significant abnormal deficit or excess returns of oil companies’ shares, which proves certain inefficiency of the market. The general outcome was that the economic event turned out to have a greater impact on the firms’ stock prices than the two natural disasters had. It was possible to distinguish a significant difference between the stock prices reactions of the larger and smaller firms regarding the economic event. The result showed that the smaller companies were affected to a larger extent.

 

Place, publisher, year, edition, pages
2011. , 36 p.
Keyword [en]
World events, event study, abnormal return, oil companies, market-adjusted model, market efficiency
Keyword [sv]
Världshändelser, eventstudie, abnormal avkastning, oljebolag, justerade marknadsmodellen, marknadseffektivitet
National Category
Business Administration
Identifiers
URN: urn:nbn:se:sh:diva-9414OAI: oai:DiVA.org:sh-9414DiVA: diva2:426232
Subject / course
Business Studies
Uppsok
Social and Behavioural Science, Law
Supervisors
Available from: 2011-06-23 Created: 2011-06-22 Last updated: 2011-06-23Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
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  • en-US
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  • nn-NO
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  • Other locale
More languages
Output format
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