We consider a project scheduling problem where the precedence constraints graph is an out-tree. The processing times can be compressed by using additional resources, which causes cost and simultaneously reduces the processing times of jobs. The objective is to minimize the sum of total lateness...

In project management, the project duration can often be compressed by accelerating some of its activities at an additional expense. This is the so-called time-cost tradeoff problem which has been extensively studied in the past. However, the discrete version of the problem which is of great...

We consider a model of an information network where nodes can fail and transmission of information is costly. The formation of paths in such networks is modeled as the Nash equilibrium of an N player routing game. The task of obtaining this equilibrium is shown to be NP-Hard. We derive...

The development of the constitution must be based on the rule of law. Direct democratic rights allow citizens to participate in the amendment process. The direct democratic process of institutional change is theoretically and empirically analyzed. A number of counter arguments and issues for a...

On the basis of abundant facility and firm-level data for German manufacturing, originating from a recent OECD-survey, this paper empirically investigates the relevance of a variety of incentives for environmentally innovative behavior of facilities, the respective influence of pressure groups,...

Ausgangspunkt für Überlegungen zur Einführung der Prozesskostenrechnung als eines Bestandteils des Qualitätsmanagements in der öffentlichen Verwaltung ist die Frage, wie die Verwaltung bei wachsenden Aufgabenanforderungen aus Politik, Wirtschaft und Gesellschaft eine noch effektivere...

In 2005, an EU-wide emissions trading scheme covering major CO2 producing sites shall come into power. The key objective of the trading scheme is to promote cost-efficiency of carbon reduction within the EU. We identify policy-relevant tradeoffs between overall efficiency, compensation and...

Hydrogen is often seen as a promising future energy carrier given the major reliance of today?s transport sector on finite fossil fuels. This working paper assesses the macroeconomic effects of introducing hydrogen as fuel in passenger transport within the framework of the computable general...

This paper focuses on dynamic interactions of equity prices among theoretically related assets. We explore the existence of intraday non-linearities in the FTSE 100 cash and futures indices. We test whether the introduction of the electronic trading systems in the London Stock Exchange in 1997...