Invasive alien trees and shrubs pose significant threats to biodiversity and ecosystem services in South African fynbos ecosystems. An ambitious initiative, the Working for Water program, commenced in 1995 to reduce the extent and impact of plant invasions. Despite substantial progress, the...

Herein we model the widespread dispersal and management of an invasive species as a weak-link public good. The risk of introduction is driven in part by economic activity, is influenced by policies directed at the risk, and economic activity responds/adapts to the risk. Framed around recent...

Different international plant protection organisations advocate different schemes for conducting pest risk assessments. Most of these schemes use structured questionnaire in which experts are asked to score several items using an ordinal scale. The scores are then combined using a range of...

Spatial and temporal issues are often important concepts within agricultural economics research. Understanding these issues and developing models that incorporate spatio-temporal frameworks can lead to more accuracy in answering important economic questions. This thesis uses the spatio-temporal...

Asian gypsy and nun moth introductions into the United States, possibly arriving on imported Siberian coniferous logs, threaten domestic forests and product markets and could have global market consequences. We simulate, using the Global Forest Products Model (a spatial equilibrium model of the...

Agricultural and wildlife trade is subject to sudden, disruptive import restrictions arising fromconcerns over sanitary and phytosanitary safety and the conservation of natural resources.These restrictions can create significant international price differences that encourage thesmuggling of...

In this paper, we study the dynamics of the market for DatabaseManagement Systems (DBMS), which is commonly assumed to possess networkeffects and where there is still some viable competition in our studyperiod, 2000 – 2004. Specifically, we make use of a unique anddetailed dataset on several...

Online applications and services automate communications andtransactions between rms and consumers, promising large efficiencygains. However, consumers have been slow to use these onlinetechnologies intensively, despite widespread adoption of the internet.Customers frequently undergo a staggered...

New network technologies constantly seek to displace incumbents. Their success depends on technological superiority, the size of the incumbent’s installed base, users’ adoption behaviors, and various other factors. The goal of this paper is to develop an understanding of competition between...

People value their privacy; however, they typically do not make the protection of their privacy a priority. Privacy is oftentimes not tangible, complicating the efforts of technology users to express and act according to their privacy needs. Additionally, people may not be fully aware of the...