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PL
The article analyzes efficiency of the Warsaw Stock Exchange with respectto dividends’ payments. The article presents possible causes of anomaly relatedto dividends, reviews the English language literature of the field and finally presents the results of empirical studies related to companies listed on the Warsaw StockExchange. The results indicate that it is possible to construct investment strategysystematically generating financial benefits which proves that the Polish capitalmarket is ineffective.
EN
The article presents the most important option pricing models based on Fourier transform. Additionally, alternative model of European option pricing to the previously developed concepts is derived. Then all models are compared in terms of computational speed and accuracy. Based on obtained results it can be concluded that the new model is the best way of option pricing.
EN
This document relates to the valuation of options using the Fourier transform. Topics covered in the document include both analysis of the traditional approaches and alternative concepts. The subject matter of particular interest is the speed and computational precision of the European-style option valuation methods.
PL
Celem artykułu jest określenie wpływu utrzymania i zmian ratingów kredytowych formułowanych przez agencję ratingową Moody’s na wysokość spreadu kredytowego na polskim rynku długu przedsiębiorstw w latach 2010–2017. Podstawowym powodem podejmowanych działań jest próba oceny, czy polski rynek długu jest efektywny w sensie informacyjnym w odniesieniu do wiadomości rynkowych, takich jak podniesienie, utrzymanie lub obniżenie ratingu. Wykorzystywana metodyka opiera się na standardowej procedurze analizy zdarzeń. Wyniki przeprowadzonych badań nie są jednoznaczne, gdyż z jednej strony wskazują na poprawną reakcję wysokości spreadu kredytowego na zmiany ocen ratingowych, z drugiej zaś otrzymane rezultaty nie znajdują potwierdzenia w testach istotności statystycznej.
EN
The purpose of the article is to determine the impact of maintaining and changing credit ratings formulated by the Moody’s rating agency on the credit spread on the Polish debt market in the period 2010–2017. It seeks to draw conclusions on the efficiency of the Polish debt market with respect factors including raising, maintaining at the current level or lowering the rating. The methodology used in the paper is based on the standard procedure for studying events. The results of the conducted research are not unequivocal. While they indicate a correct response of the credit spread to changes in the credit ratings, the results obtained are not confirmed by statistical significance tests.
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