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Linkages between American and European publicly traded airline companies – evidence resulting from the Diebold-Yilmaz method

100%
Łęt B.
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
|
2020
|
issue vol. 64, nr 4
101-114
EN
In this paper, the author implemented the Diebold and Yilmaz approach to analyse the connectedness between the major American and European publicly traded airline companies. The author calculated the return and volatility spillover index for the whole sample using a dynamic rolling sample analysis. The results show that all airlines are significantly linked but there is a clear division into two markets. It was found that return spillovers are more intensive than volatility spillovers. Moreover, the average connectedness level is higher in the U.S. market for returns as well as for volatility. An increase of connectedness occurred due to the certain events: issues linked with the condition of the global economy and long-term crude oil price changes.
PL
W artykule przedstawiono wyniki badania powiązań w świetle metody Diebolda i Yilmaza pomiędzy notowaniami najważniejszych linii lotniczych w Stanach Zjednoczonych i w Europie. Wyznaczono indeks powiązań dla dziennych zwrotów i zmienności dla całej próby oraz w ujęciu dynamicznym. Wyniki badania wskazują, że notowania wszystkich analizowanych linii lotniczych są ze sobą powiązane, ale istnieje wyraźny podział na dwa rynki. Powiązania między rynkiem europejskim a amerykańskim są znacznie słabsze niż efekty zarażania pomiędzy liniami lotniczymi z jednego rynku. Efekty zarażania są silniejsze dla zwrotów niż dla zmienności. Ponadto średni poziom indeksu powiązań jest wyższy w Stanach Zjednoczonych niż w Europie. Na zmiany poziomu powiązań w czasie miały wpływ wydarzenia z otoczenia makroekonomicznego i rynku kapitałowego oraz długotrwała zmiana poziomu ceny ropy naftowej.
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Linkages of natural gas and oil futures prices on the American and European derivatives market

100%
Łęt B.
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
|
2017
|
issue 482
158-168
EN
In recent years, the world natural gas market is changing mainly due to the wid-er access to LNG (Liquefied Natural Gas). This technology allows to trade between the market participants all over the world. The natural gas prices on the American and European market are benchmarked to Henry Hub and National Balancing Point (NBP) natural gas. The goal of this paper is to investigate whether the listings of natural gas in the derivatives markets are linked and to analyse the relationship between natural gas and crude oil prices. We show that the probability distribution of returns is not normal and that there is a strong ARCH effect. We use multivariate GARCH model to describe the linkages between several series. We take into account two return series of natural gas futures contracts (Henry Hub and National Balancing Point) and two returns series of crude oil futures contracts (West Texas Intermediate and Brent) to measure the strength of linkages across two commodity markets of the most important fossil fuels.
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