Exploring Communication Activities in Online Communities: A Longitudinal Analysis in the Financial Services Industry

Online communities (OCs) are seen as important stimulus to electronic business. However, surprisingly little is known about how the communication activity of their participants develops and changes over time. A longitudinal study bears the potential to better elaborate the enabling and inhibiting factors of the participant's communication activity in OCs. To explore these phenomena, we aimed to develop a conceptual framework that serves as a foundation to guide an explorative data analysis of real OCs. We use the notions of common ground, information overload, interactivity, and social loafing to explain the communication activity of the participants in OCs. The empirically explored framework will help organizations to support the development of OCs and utilize them in an economically successful way.

Based on a literature review, we developed a first conceptual framework. Then, we apply it to describe the development of the communication activity and its determinants in an OC hosted by a German financial service provider. In this study, we examined over 33,000 participants and 1.03 million messages over a period of 3 years. We found a strong effect of external factors on the size of this OC. The size of the OC showed no direct influence on the communication activity of the participants. However, in reaction to the increasing information load, communication strategies changed and herewith influenced the communication activity. The heterogeneity of the participant's activity was growing over time, and a small minority of participants wrote more and more of the postings.     

Visionary projects: a viable rationale for human space-flight?

Today's prevailing geo-political and socio-economic climate is proving unfavourable towards justifying on-going and future human space-flight programmes. Traditionally cited benefits, such as scientific and aconomic progress or political advantages, are widely deemed insufficient reasons for spending considerable amounts of public funds. A rationale for human space-flight, evoking visions such as exploitation of extraterrestrial resources or human exploration of space, has to cope with an unavoidable dilemma: attractive as they may appear, these projects are fraught with many grave uncertainties and risks. This paper attempts to answer the question over what, if any, significance such visionary projects may assume in justifying the continuation of human space-flight activities. We argue that, despite as yet unanswerable technological and economical questions, and despite the extremely long time-frames involved, it seems reasonable and, hence, justified to keep the option of being able to solve by means of humans in space the impending energy crisis in the coming century.     

Pollution control with imperfectly observable emissions

In this paper, a model of environmental regulation with imperfect monitoring of emissions is presented. The regulator can use linear output taxes and emission taxes to influence the pollution level of a risk-averse firm. In contrast to the perfect monitoring case, a tax mix will usually be optimal. The relative weight depends on the degree of risk aversion and monitoring imperfection, and on technological factors.     

Competition and investment — A unified approach

Using a simple but general two-stage framework, this paper identifies the circumstances under which increasing competition leads to more cost-reducing investments. The framework can, for instance, capture increasing substitutability for different types of oligopoly models or changes from Cournot to Bertrand competition. The paper identifies four transmission mechanisms by which competition affects investment. For a firm with lower initial marginal costs (higher efficiency), a positive effect of competition on investment is more likely. Positive spillovers support a negative effect of competition on investment. The relation between competition and investment is not affected in an unambiguous way by the level of pre-existing competition.