Based upon the foundations of mean-variance decision-making theory, we demonstrate that a change in the risk situation of an international enterprise open currency position does not inevitably require a corresponding hedging accommodation. Given a new risk situation, whether a revision of the...

We collect more than eight million German-language tweets on the war in Ukraine and use a machine learning approach toconstruct a daily index of uncertainty about the war. In an empirical model, we show that fluctuations in uncertainty have strong effectson financial markets and real economic...

We collect more than eight million German-language tweets on the war in Ukraine and use a machine learning approach toconstruct a daily index of uncertainty about the war. In an empirical model, we show that fluctuations in uncertainty have strong effectson financial markets and real economic...