Die Neuausrichtung der US-Zollpolitik unter Präsident Trump zeigt deutliche Auswirkungen auf deutsche Exporte: Vorzieheffekte im Frühjahr 2025 gingen ab April in spürbare Rückgänge über. Besonders betroffen sind Warengruppen mit Sonder- oder Basiszöllen, etwa Fahrzeuge und Maschinen....

Despite a strong start to 2025, the German economy will experience middling growth for the time being before beginning a long-awaited upturn at the end of the year. DIW Berlin's forecast indicates growth of 0.3 percent for 2025 and of 1.7 percent for 2026; thus, DIW Berlin is increasing its forecast...

This study evaluates cryptocurrency market efficiency through an analysis of 25 leading cryptocurrencies traded between 2014 and 2024. This research employs the Augmented Dickey-Fuller (ADF) test and its Fourier-augmented variant (Fourier ADF, FADF), the Kapetanios-Shin-Snell (KSS) test, and its...

This study examines the market efciency in the prices and volumes of transactions of 41 cryptocurrencies. Specifcally, the correlation dimension (CD), Lyapunov Exponent (LE), and approximate entropy (AE) were estimated before and during the COVID-19 pandemic. Then, we applied Student's t-test...

"With its fresh and deeply personal perspective on what it takes to lead with resilience and authenticity, this book challenges the traditional playbook on leadership by placing purpose at the core of every decision and action. In a world increasingly defined by uncertainty and rapid change,...

This study endeavors to unravel the structured and sequential intricacies underlying the empirical da-ta-generating process (DGP) and the captivating evolutionary dynamism of Islamic fixed income securi-ties. To achieve this goal, we delve into the realm of nonlinear dynamics governing the Dow...

This dissertation provides a contribution to the option pricing literature by means of some recent developments in probability theory, namely the Malliavin Calculus and the Wiener chaos theory. It sheds new light on some old and complicated problems by means of these new techniques. It...

We develop a nonlinear duopoly model in which the heuristic expectation formation and learning behavior of two boundedly rational firms may engender complex dynamics. Most importantly, we assume that the firms employ different forecasting models to predict the behavior of their opponent....

We propose a simple agent-based version of Paul de Grauwe's chaotic exchange rate model. In particular, we assume that each speculator follows his own technical and fundamental trading rule. Moreover, a speculator's choice between these two trading philosophies depends on his individual...

This investigation explores the application of Dao and Yijing, pillars of Chinese philosophy, to developing a nuanced leadership theory. The paper suggests that quantum systems' holistic and interconnected nature offers valuable leadership lessons in complex modern contexts. It promotes agile...

As the economy enters a phase transition into an aperiodic state, the tech industry finds itself at the brink of chaos. Inflated evaluations in private markets before IPOs and increasing Shannon entropy of post-IPO share prices reveal a market teetering on the edge. But is it a phase transition,...

The flower pollination algorithm (FPA) is a nature-inspired optimization algorithm that mimics the pollination behaviour of flowering plants. Despite the promising performance of FPA in solving single objective optimization problems, its convergence still poses challenges in practice. This study...