Araştırma Çıktıları / Research Outcomes

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Author: search.filters.author.Ceyda AKTANHas files: Yes

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Now showing 1 - 3 of 3
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    Publication
    IMPACT OF MAJOR GLOBAL EVENTS ON THE TURKISH STOCK MARKET EFFICIENCY
    (2022) Ceyda AKTAN; Türk Hava Kurumu Üniversitesi, İşletme Fakültesi, Yönetim Bilişim Sistemleri Bölümü, Ankara, Türkiye
    Market efficiency is of great importance to many investors, policy makers, as well as researchers. It provides them with information regarding the market and acts as a guide in their decision-making process. For this reason, there have been extensive amount of research done through the years. However, the World has witnessed several major events in the last couple of decades, which has been of great importance for financial markets, having both direct and indirect impacts. The Global Financial Crisis of 2008 and the COVID-19 pandemic can be the two most important events the World has experienced. Although past research shows that the impact of both events on the efficiency of the stock markets were looked at in separate studies, there is lack of studies involving both major events and analysing how the efficiency of the stock market is changing between these periods. The aim of this study is to analyse the weak-form efficiency of the Turkish stock market and how it has evolved over time. There are 4 different data sets used to observe the changes in market efficiency, with full sample ranging from February 1988 to September 2022. Monthly closing prices of the BIST100 Index are analysed using both the traditional linear Augmented Dickey-Fuller unit root test and 5 different non-linear unit root tests. Results show that different tests have different strengths in capturing the stationarity and due to the LNV test Turkish Stock Market was found not to be weak form efficient.
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    Publication
    An Economic Analysis on the Use of Resources Allocated for Defense: An Empirical Study on Turkey
    (Ege Akademik Bakis (Ege Academic Review), 2023-03-13) Ceyda AKTAN; Yaşar KÖSE; Emre YILMAZ
    In this study, the relationship between Turkey's defense expenditures and the independent variables selected as gross domestic product, foreign debt, and unemployment, in a 33-year period between 1998 and 2020, were examined using the Toda-Yamamoto causality test. According to the findings, it has been observed that there is causality from defense expenditures to gross domestic product, that is, the change in defense expenditures affects gross domestic product. Similarly, causality has been determined from defense expenditures to external debt. Therefore, it is possible to state that the change in defense expenditures will have an impact on foreign debt. In this respect, the findings are in agreement with the literature. The increase in defense expenditures will increase the production of the defense industry, the export of this production will result in a resource inflow to the country and the gross domestic product will increase. On the other hand, in some countries, defense expenditures will be financed by debt from foreign sources, which will increase foreign debt.
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    Publication
    Uçak Kazaları ile Hisse Senedi ve Şirket Değeri Arasındaki İlişkilerin Belirlenmesi: Havayolu Taşıyıcısı ve Uçak Üreticisi Şirketler Üzerinde Analitik Bir Çalışma
    (Eskisehir Osmangazi University Journal of Economics and Administrative Sciences, 2022-04-01) Yaşar KÖSE; Ceyda AKTAN
    Çalışmanın amacı, havayolu sektöründeki uçak kazaları ile ticari havayolu taşıyıcı şirketleri ve ticari uçak üreticisi şirketlerin hisse senedi fiyatları arasında bir ilişkinin olup olmadığının belirlenmesidir. Dünyada havayolu sektöründe yer alan havayolu taşıyıcı şirketleri ve büyük uçak üreticisi iki şirketin 2013-2020 yıllarında yaptıkları toplam 38 adet uçak kazası sonrasındaki ilk gün ve takip eden haftanın günlerindeki anormal getirileri ile kümülatif anormal getirileri analiz edildiğinde; uçak kazalarının bazılarında kazadan sonraki ilk ve takip eden 7 gün içinde gerek havayolu taşımacı şirketlerinin gerekse uçak üreticisi şirketlerin hisse senetlerinin değerlerinde genel olarak düşüş yaşanırken, bazı uçak kazalarından sonraki günlerde hisse senetleri değerlerinde değişim olmadığı veya artış yaşanmadığı görülmüştür.