We consider an optimal stopping problem in a certain model described by a stochastic delay differential equation. We reduce the initial problem to a free-boundary problem of parabolic type and prove the corresponding verification assertion. We also give an example of such an optimal stopping...

Empirical studies of open-market share repurchases in the U.S. typically find a mean abnormal return around the announcement day of about 3%. In Germany share repurchases were highly restricted before May 1998. Since then firms have repurchased shares in the open market more than 250 times....

This paper derives new results on the effects of employing Taylor rules in economies that are subject to real market imperfections such as production externalities. Taylor rules that aggressively respond to output can eliminate sunspot equilibria that arise from the increasing returns. The paper...

Stochastic Delay Differential Equations (SDDE) are Stochastic Functional Differential Equations with important applications. It is of interest to characterize the L2-stability (stability of second moments) of solutions of SDDE. For the class of linear, scalar SDDE we can show that second...

The paper provides an axiomatic characterization of dynamic risk measures for multi-period financial positions. For the special case of a terminal cash flow, we require that risk depends on its conditional distribution only. We prove a representation theorem for dynamic risk measures and...

Granger unterstellt in seinem Kausalitätskonzept stationäre Daten. Zeitreihendaten weisen aber oft Trend- und/oder Saison-Einflüsse auf, die vor einer Schätzung eliminiert oder modelliert werden müssen. Ausgangspunkt der Stationaritätsprüfung im VAR-Modell sind meist Einheitswurzeltests....

Standortwettbewerb der Bundesländer ist prinzipiell eine gute Sache. Er bringt Effizienzgewinne, Kosteneinsparungen, verbesserte Leistungsangebote durch Konkurrenzdruck und präferenzgerechtere öffentliche Institutionen. Aber er kann dies nur, wenn es zu einem wirklichen Wettbewerb kommt....

Staatsverschuldung wird hier als ein negativer externer Effekt verstanden, den Politiker ausüben, um die Kosten ihres politischen Angebots zu senken und somit im politischen Wettbewerb bestehen zu können. Die Gegebenheiten des politischen Wettbewerbs und die Möglichkeit diesen externen Effekt...

Sterilized foreign exchange market interventions are commonly dismissed by economists as an ineffective policy instrument. Nevertheless many central banks operating under independently floating exchange rates regimes are often engaged in sales and purchases of foreign exchange in order to...