Sveriges regering införde 1 april 2018 en passagerarskatt på flygresor, med målet att flyget ska bära sina egna klimatkostnader och minska flygets miljöpåverkan. Denna studies syfte är att undersöka hur den svenska flygskatten har påverkat antalet inrikesflyg- och tågresor i Sverige. Metoden som används är den kvasi-experimentella metoden difference-in-difference, där Sverige används som behandlingsgrupp och Finland som kontrollgrupp. Perioden som studeras är januari 2013 till december 2019. Resultatet i studien visar att förändringen i antalet tågresor är betydligt större än minskningen i antalet flygresor, vilket beror på den starkare ökande trenden i tågresandet som råder i Sverige. Effekten av flygskatten på det inhemska tågresandet går därför inte att utläsa i studien. En minskning av antalet inrikesflygresor i Sverige med 53 000 resor i månaden kan emellertid utläsas. Detta resultat är statistiskt signifikant på fem procentsnivå och påvisar att flygskatten haft en effekt på inrikesflygresandet. / On the 1st of April 2018, the Swedish government introduced a tax on air travel, with the intention that the airlines should bear their own climate costs and to reduce the plane’s environmental impact. The object of this study is to examine how the Swedish aviation tax has affected the amount of total internal flight and train journeys in Sweden. The method used is the quasi-experimental method difference-in-differences, where Sweden is used as the treatment group and Finland as the control group. The period of analysis is from January 2013 to December 2019. The result of this study shows that the increase in the amount of train passengers is considerably larger than the decrease in the amount of flight passengers, which depicts the stronger upgoing trend in train journeys in Sweden. Therefore, it is not possible to see the effect of the aviation tax on the internal train journeys in this study. Yet it is feasible to see a diminishment in the amount of internal flight journeys by 53 000 journeys a month in Sweden. This result is statistically significant on a level of five percent and demonstrates that the aviation tax has had an effect on the amount of internal flight journeys.

Bakgrund: Kvinnors representation i styrelsen har varit en aktuell fråga som länge diskuterats i det svenska samhället och om det borde införas en kvoteringslag. Sverige är ett av de mest jämställda länder Europa, trots det finns markanta gap i kvinnors representation bland de ledande positionerna. Glass cliff-fenomenet antyder att kvinnor anlitas till ledarskapspositioner i osäkra förhållanden, vilket kan förklara den underrepresentation som existerar hos styrelsen. Vi frågar oss själva om glass cliff-fenomenet kan appliceras på kvinnliga ledamöter i den svenska kontexten. Syfte: Studiens syfte är att undersöka om ett glass cliff-fenomen existerar bland bolag noterade på OMX Stockholm inom small, mid och large-cap kategorin. Metod: Longitudinell studie med en deduktiv ansats där teorin testas mot studiens hypotesprövning. Urvalet består av 86 förlustföretag noterade på Stockholmsbörsen mellan år 2010 och 2018. Slutsats: Från resultatet fann vi att det inte existerade ett glass cliff-fenomen bland de svenska börsbolagen på small, mid och large-cap kategorin.

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The augmented phase portrait, introduced by Sabrina Streipert and Gail Wolkowicz, is used to analyze second order rational discrete maps of the form \begin{align*} x_{n+1} = \frac{\alpha + \beta x_n + \gamma x_{n-1}}{A + Bx_n + C x_{n-1}}, \text{ for } n \in \mathbb{N}_0 =\{0,1,2,\dots, \} \end{align*} with parameters $\alpha, \, \beta, \, \gamma, \, A, \, B, \, C \geq 0$, and initial conditions, $x_{0}, \, x_{-1} > 0$. First we study the special case, \begin{align*} x_{n+1} = \frac{\alpha + \gamma x_{n-1}}{A + Bx_n}, \end{align*} with $\alpha, \, \gamma, \, B > 0$ and $A \geq 0$. Applying the change of variables, $y_n = x_{n-1}$, this equation can be rewritten as a planar system. We provide a new proof to show that oscillatory solutions have semicycles of length one, except possibly the first cycle, and that nonoscillatory solutions must converge monotonically to the equilibrium. This was originally done by Gibbons, Kulenovic, and Ladas. We also show that when the unique positive equilibrium is a saddle point, there exist nontrivial positive solutions that increase and decrease monotonically to the equilibrium, proving Conjecture 5.4.6 from the monograph by Kulenovic and Ladas. In particular, Theorem 1.2 from this monograph defines the tangent vector to the stable manifold at the equilibrium. We show that specific regions defined by the augmented phase portrait have solutions that increase and decrease monotonically to the equilibrium along the stable manifold. While Conjecture 5.4.6 was previously proven in a paper by Hoag and a paper by Sun and Xi, our proof provides a more intuitive and elementary solution. We then consider the case, \begin{equation*} x_{n+1} = \frac{\alpha + \beta (x_n + x_{n-1})}{A + B(x_n + x_{n-1})}, \end{equation*} with $\alpha, \beta, A, B > 0$. Again, using $y_n = x_{n-1}$, this system can be written as a planar system. Thus, applying the augmented phase plane, we prove global asymptotic stability of the positive equilibrium for some cases. In other cases, we show this using other theorems from the monograph by Kulenovic and Ladas as was previously done by Atawna, et al. / Thesis / Master of Science (MSc) / The augmented phase portrait, introduced by Sabrina Streipert and Gail Wolkowicz, is used to analyze second order rational discrete maps with nonnegative parameters and positive initial conditions. Using a change of variable to transform the second order rational discrete maps into planar maps, various properties of solutions were analyzed for various cases. For one case, we provide a new proof to show that oscillatory solutions have semicycles of length one, except possibly the first cycle, and that nonoscillatory solutions must converge monotonically to the equilibrium. This was originally done by Gibbons, Kulenovic, and Ladas. We also prove Conjecture 5.4.6 from the monograph by Kulenovic and Ladas, showing the existence of solutions that increase and decrease monotonically to the equilibrium. While Conjecture 5.4.6 was previously proved in a paper by Hoag and a paper by Sun and Xi, our proof provides a more intuitive and elementary solution. Finally, for another case we prove global asymptotic stability of the positive equilibrium using the augmented phase portrait. Sometimes, we show this using other theorems from the monograph by Kulenovic and Ladas as was previously done by Atawna, et al.

Uppsatsen syftar till att undersöka huruvida införandet av investeringssparkontot har orsakat lägre transaktionskostnader och således ökat sparande i noterade aktier hos svenska hushåll. För att undersöka införandet av investeringssparkontot i Sverige har en kontrollgrupp skapats med länder som hittills inte infört någon liknande kontoklass. Uppsatsen utgår ifrån kvartalsvisa observationer hos Sverige och kontrollgruppen under perioden 2000–2020. I syfte att studera resultatet har en difference-in-difference metod använts som jämfört Sveriges utveckling mot ett viktat snitt av länder i en kontrollgrupp. Kontrollgruppens utveckling ger en indikation om hur hushållens sparande i Sverige hade utvecklats utan investeringssparkontot. Uppsatsen finner ingen statistisk signifikans att de svenska hushållens sparande i aktier ökat relativt kontrollgruppen efter införandet av ISK. Däremot finns en deskriptiv tendens för ökat sparande vilket kan vara intressant för framtida studier. / The purpose of this thesis is to determine whether adopting “investment savings account” has led to lower transaction costs and thus increased the level of savings in publicly traded stocks in Swedish households. To examine this relationship, a control group consisting of several different countries with no clear counterpart has been created. The data contains quarterly observations from the period 2000 - 2020. A difference-in-difference method has been applied to observe the results from Sweden in contrast to the weighted average of the control group. The development of the control group gives an estimate of Sweden´s savings without the treatment. The study concludes that Swedish households has no significant increase in stock savings relative to the control group, however it shows a descriptive tendency for an increase in savings that could be relevant for future research.

Recently a viscoelastic turbulence closure model, based on that of Townsend (1976), for wind-wave interactions by turbulent wind has been proposed by Sajjadi (2001). In that work, the governing equations of mean and turbulence were linearized and solved analytically using an asymptotic method. In this work the equations derived by Sajjadi were solved numerically for the cases of strong turbulence due to wind over surface of a monochromatic water wave. Vortex shedding has been observed at high wind velocities. Also, a layer of vortices separating the main flow of wind from the water surface was observed from the results for high velocities of wind. A finite difference scheme was devised which is second order accurate. The results were compared with another scheme based on the method of superposition coupled with orthonormalization by Scott andWatts (1977). The two schemes agree reasonably well for high velocities while they differ for low velocities. Two test cases were implemented to test the finite difference scheme. The tests show that the finite difference scheme predicts accurate solutions for inhomogeneous equations, while it fails to capture the accurate solution if a non trivial solution exists for homogeneous equations. This is attributed as the reason for the difference in the results.

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It is well known that cultural difference could affect people’s attitude, behavior and cognitive processes. Previous studies have shown a cross-cultural difference on self-construal between Western Caucasian (WC) and East Asian (EA), as well as their culturally distinguished motivational strategies, cognitive and emotion regulation methods. “Cushion hypothesis” (Hsee & Weber 1999) has suggested that WC were more risk aversive than EA during economic decision, because of dissimilar familial-social economic supporting system between two cultures. The current study digs in depth to these differences in emotional experience associated with decision making and discovers how cultures effect people’s counterfactual emotions—the “what if” emotion—during economic decision making. There are two types of counterfactuals thoughts we are looking at: regret and relief. Regret is triggered if an alternative action would have led to a better outcome, while relief is triggered if an alternative action would lead to equal or worse outcome. WC are expected to be more self-reliance, therefore would be more conservative about financial decision, and greater vigilant at economic choices prompting WC to process prior decision that led to least undesirable economic outcome; while EA are easier to get financial help form their families, would hold a relatively more relax attitude, compare to WC, about risk-taking behavior on economic decision, and be more chilled after receive preferable outcome than WC. Current study will use electropherogram (EEG) to record different event-relative potential (P2, P3 and LPP) and both FC (frontal central lobe) and CP (central parietal lobe) regions to examined how cultural difference affects counterfactual emotions during economic decision making, at both initial spontaneous arousal stage, P2 and conscious effortful emotional appraisal stage, LPP. Additionally, self emotional rating was included in the present study to consolidate validity of the task. In our results, all subjects rated happier on Relief than Regret, and Certain than Gamble conditions, only in Relief condition WC rated happier than EA, and only WC rated happier on Certain condition than Gamble condition. The emotional effect showed at P2 in FC suggested that positive result in regret condition could lead a more intensive immediate emotion arousal. Coincidently, the main effect of emotion at LPP, in the opposite direction compared to P2, at FC, might suggest an overall convoluted counterfactual emotional processing. At P3, choices by culture interaction presented at both region, further, only EA, but not WC, had a greater arousal in gamble condition than certain. This suggested a difference in cognitive processing of choices was different between two cultures. Interestingly, a three-way interaction was found at CP during P3, indicate a complexity of culture discrepancy of emotional process. Finally, a co-relation test between LPP signal and self-emotional rating was conducted, for the coincident of result of main effect of choices plus a marginal choices by culture interaction between behavioral rating and LPP. As the result, only in EA, at both choices conditions, the rating is positively related to LPP amplitude. Overall, both at P3 and LPP we found cultural specialized results correlated with choices condition, which indicated a obscure cultural effect on cognitive process. Moreover, the marginal three-way interaction at P3, CP, may suggest a cultural effects on both economic decision-making related cognitive process and emotional response.