We develop a system dynamics model of message-based communication, where the information-processing capacity of message recipients is limited. Profit-seeking broadcasters send messages, but only some of these messages are valuable to recipients. Recipients cannot determine whether or not a...

Email marketing is a legitimate, lucrative, and widely used business tool, but it is in danger of being overrun by unwanted commercial email (also known as spam). Conventional approaches to maintaining the robustness of legitimate email attack pieces of the problem. In contrast, this article...

As filters improve, the information assets of spammers become more valuable and lead to more, not less, overall spamming activity. This is troubling to contemplate, because it means no amount of spending on better filters will be enough. The next levels of escalation might then involve...

Unsolicited commercial e-mail (UCE) is a significant problem of the digital commons, but there has been little empirical analysis of proposed solutions and underlying mechanisms. This study, based on an analysis of 47 million inbound e-mail messages drawn from a cross-section of e-mail inbox...

The phenomenon of unwanted commercial messages (UCM), including e-mail spam and emerging forms that target other Internet communications facilities, is analyzed from an information-economics perspective. UCM traffic pays off for its senders when it is noticed and consumed by Internet users; the...

This article analyzes the long-term financial sustainability of small tuition-based colleges in the context of rapid and accelerating transformation caused by demographic changes in the undergraduate student market

Educational programs leading to degrees in system dynamics are rare and thus of critical importance to the future of the field of system dynamics. However, to a large extent such programs have not yet been made transparent to the system dynamics community as a whole. The present article...

Wireless industry has enjoyed an impressive growth over the past few years. However, recent developments in the marketplace suggest that future growth depends on offering customized mobile commerce-related data services targeted at commercial customers. A theoretical framework that we introduce...

Existence theory in economics is usually in real domains such as the findings of chaotic trajectories in models of economic growth, tatonnement, or overlapping generations models. Computational examples, however, sometimes converge rapidly to cyclic orbits when in theory they should be...

This paper provides an example of a system dynamics model that incorporates soft variables. The model examines the challenges that a superpower faces while maintaining its position in the global economic system. The effects on aggregate welfare of the population at home and abroad, as well as,...