Infection and immunization: A new class of evolutionary game dynamics

Building upon a central paradigm of evolutionary game theory, namely the invasion barrier, we propose the new Infection and Immunization Dynamics (InfImmDyn), modelling a plausible adaptation process in a large population. For general games, this yields a novel refinement of the Nash equilibrium concept based on dynamical arguments, close in spirit to Nash's original “mass action” idea in his Ph.D. thesis. For partnership games, InfImmDyn exhibits a better asymptotic behavior compared to other popular procedures like Fictitious Play and Replicator Dynamics. We establish even support separation of InfImmDyn in finite time, which can never be achieved by any interior-point method like those mentioned above. In fact, this property has not yet been established for any other evolutionary game dynamics.     

An Interperiod Network Storage Location–Allocation (INSLA) model for rail distribution of ethanol biofuels

In response to the US federal renewable fuels standards, new ethanol plants of varying sizes are being established in the US. The transportation challenge is to decide on how best to move raw materials to these existing and new ethanol plants, and to ship the fuel from the ethanol plants to markets around the country. In this paper, we extend the Interperiod Network Storage Location–Allocation (INSLA) model formulation into a Rail-INSLA model to address the transportation/transshipment issues associated with the rail distribution of ethanol biofuels that include: transporting less than unit train quantities from each plant, developing new sidings at ethanol plants to accommodate a unit train, and determining the optimal number and locations for carrier operated terminals for the agglomeration of less than unit train size shipments into unit train shipments.     

Human capital and leadership: the impact of cognitive and noncognitive abilities

We conduct an economic analysis about the impact of human capital on an individual’s potential of becoming a leader based on data from the Programme for the International Assessment of Adult Competencies Survey (PIAAC). Our human capital indicators include not only traditional measures such as education and experience, but also various measures of cognitive and noncognitive ability. Our cognitive ability measures include numeracy, literacy, and problem solving abilities, and noncognitive ability measures include perseverance, motivation to learn, and social trust. We specifically investigate the effect of measurement error and reverse causality on the estimation results. We find that problem-solving ability is the most important in affecting leadership among cognitive ability measures, and perseverance shows the strongest impact among noncognitive ability measures. As a leader supervises more employees, the role of cognitive and noncognitive ability becomes more critical.     

From Medics to Managers: The Ascent of the Entrepreneur

Where one stands to engage with the world is not as some New Age Psychologists continue to argue, completely free and self-determined. Rather, it is formed largely beyond one’s control and is fraught with both dangers and opportunities. This pre-determined point of view is referred to as the Assumptive World (Parkes, 1975). This is defined as a “strongly held set of assumptions about the world and the self that is confidently maintained and used as a means of recognizing, planning and acting…Assumptions such as these are learned and confirmed by the experience of many years” (Parkes, 1975, p. 132). There are, further, levels and intensities of assumptions, as refined by Janoff-Bulman, R. (1992). These assumptions form the centre point of our world and our consciousness. They are so much a part of us that we tend not to challenge them. Though unchallenged, these assumptions nevertheless drive our behaviors, set our expectations, and operationalize our moral views.     

Wages and Contracting Out: Does the Law of One Price Hold?

We find that, conditioning on industry of assignment, cleaners and security guards who participate in activities organized by contract companies earn 15 and 17 per cent less, respectively, than workers in those activities organized in‐house. These estimates are hardly affected by the inclusion of a set of jointly statistically significant exogenous variables. We can expect that most of the productive traits that characterize a task are transferred to the contractor in the process of contracting out a cleaning or security task. Thus, our findings are hard to rationalize by a simple competitive labour market setting where the law of one price holds.     

A Structural Approach to Market Definition With an Application to the Hospital Industry

Market definition is common in merger analysis, and often the decisive factor in antitrust cases. This has been particularly relevant in the hospital industry, where many merger challenges have been denied due to disagreements over geographic market definition. We compare geographic markets produced using frequently employed ad hoc methodologies to structural methods that directly apply the ‘SSNIP test’ to California hospitals. Our results suggest that markets produced using previous methods overstate hospital demand elasticities by a factor of 2.4 to 3.4 and were likely a contributing factor to the permissive legal environment for hospital mergers.     

Corporate Giantism,Degradation of the Plane of Competition,and Countervailance

Thorstein Veblen argued, in The Higher Learning in America, that universities were at risk of being captured by the same pecuniary aims as business enterprise. His argument remains relevant today, given that many observers claim that higher education is headed for fundamental transformation. These changes are occurring in response to a number of challenges facing higher education in the United States — financial, demographic, and cultural, aiming both to reform what is seen by many as a system resistant to change and accountability, and to take advantage of new technologies seen as improving accessibility and convenience for its consumers, the students. I briefly review Veblen’s argument by using its general contours as a lens for the major disruptions occurring in higher education today, and specifically the rise of for-profit universities, the expansion of online learning and massive open-online courses (MOOCs), and the growing movement to unbundle the educational experience.     

Socioeconomic dimensions of mercury pollution abatement: Engaging artisanal mining communities in Sub-Saharan Africa

In recent years, strategies to tackle mercury pollution from artisanal gold mining have mainly included restrictions — banning mercury trade internationally, prescribing alternate technologies and tightening regulations on mining (e.g. banning mercury use). However, artisanal mining communities in Africa are often trapped in cycles of poverty that make it difficult for workers to improve technologies and reduce mercury pollution. This article assesses problems with narrow pollution abatement discourses and top-down regulations, examining the need for integrated approaches to address pollution and socioeconomic challenges in low income mining communities. It advances the hypothesis that pollution abatement strategies fail if they do not explicitly address local socioeconomic capacities for improving environmental management, informed by an adaptive understanding of labor dynamics. Case studies in Mozambique and Tanzania are examined where United Nations pilot projects sought to address local challenges. These combined training on improved technologies and environmental risk mitigation with efforts to empower miners by enhancing access to microfinance services and fairer gold marketing arrangements. These case studies demonstrate adaptive ways of engaging local concerns in mining areas, highlighting lessons that are especially urgent now that recent policy commitments from Europe and the United States to ban mercury exports have specifically sought to make mercury more expensive for African mining communities. Ultimately, the analysis suggests how regionally focused ecological economics research has a vital role to play in (a) revealing how narrowly conceived responses to pollution can yield counterproductive results as well as exacerbate exploitative labor conditions in low income contexts; and (b) stimulating analytic focus on innovative ways of integrating pollution reduction strategy with grassroots socioeconomic empowerment strategies.