Scheduling Super Rugby

We develop scheduling models of Super Rugby, the existing Super 14 (2006–2010) and the proposed Super 15 (from 2011), and the revised national provincial ITM Cup competition (from 2011). Developing schedules for these competitions involves a large number of competition design decisions and scheduling compromises between team welfare, travel, television, and revenue management. We show that Super 15 addresses some of the complications that arose in scheduling Super 14. The 2011 ITM cup features a very tight scheduling window due to the Rugby World Cup, with 10 matches per team over a 7 week period. The schedules developed show that it is possible to accommodate most of the (assumed) preferences of teams and organisers

Virtual Reconstruction and Morphological Analysis of the Cranium of an Ancient Egyptian Mummy

A mummy of an Egyptian priestess dating from the 22nd dynasty (c. 770 BC), completely enclosed in an anthropoid (human shaped) coffin, was scanned on a CT scanner. An accurate reconstruction of the cranium was generated from 115 × 2 mm CT images using AVS/Express on a SGI computer. Linear measurements were obtained from six orthogonal cranial views and used in a morphometric analysis software package (CRANID). The analyses carried out were both linear and nearest neighbour discriminant analysis. The results show that there is a 52.9% probability that the mummy is an Egyptian female, with a 24.5% probability that mummy is an African female. Thus the technique confirms that the coffin contains an Egyptian female, which is consistent with the inscription on the coffin and the shape of the pelvic bones as revealed by plain X-rays. These results show that this technique has potential for analysing forensic cases where the bones are obscured by soft tissue and clothing. This technique may have an application in virtual autopsies

Organizationally Sensible vs. Legal-Centric Approaches to Employment Decisions With Legal Implications

This article is intended to: 1) alert human resource (HR) professionals to the risk that they, and the managers they serve, are unnecessarily contributing to the impact of legal considerations on the management of employees as a result of “legal-centric decision making”; and 2) provide information and guidance that will assist HR professionals in promoting better informed, more organizationally sensible responses to employment issues that have potential legal implications. The “legal-centric decision making” construct is introduced and illustrated, a model of the primary factors contributing to legal-centric decision making is presented, and keys to avoiding legal-centric decision making are identified and discussed

Legally Defensible vs. Organizationally Sensible: Avoiding Legal-Centric Employment Decision Making

Managers and human resource professionals express grave concern about the increasing influence that the law and lawyers are having on their ability to manage employees effectively. Blame is typically placed on growing governmental regulation of the employment relationship, a “litigation mentality” among workers, and overly aggressive lawyers pursuing selfish interests. Much less common, however, is attention focused on the role that organizational decision makers play in contributing to the perceived problem. This article is intended to help address that limitation by alerting managers to the likelihood that they are unnecessarily contributing to the impact of legal considerations on the management of employees as a result of “legal-centric decision making”, and by providing information and guidance that will assist them in formulating better informed, more strategic responses to employment issues that have potential legal implications. Keys to implementing the strategic approach are identified and discussed, and the approach is illustrated by applying it to a decision that American employers continue to confront: how to respond to the eroding employment at-will doctrine. The analysis strongly suggests that the extent of the law’s negative influence on the management of employees can be moderated significantly if organizational decision makers recognize their contribution to “the problem”, focus on what is organizationally sensible rather than what is perceived to be legally defensible, and adopt a more strategic (less legal-centric) approach to the challenges posed by employment decisions that raise legal concerns

The Costs of Financial Crises: Resource Misallocation, Productivity and Welfare in the 2001 Argentine Crisis

Financial crises in emerging market countries appear to be very costly: both output and a host of partial welfare indicators decline dramatically. The magnitude of these costs is puzzling both from an accounting perspective -- factor usage does not decline as much as output, resulting in large falls in measured productivity -- and from a theoretical perspective. Towards a resolution of this puzzle, we present a framework that allows us to (i) account for changes in a country's measured productivity during a financial crises as the result of changes in the underlying technology of the economy, the efficiency with which resources are allocated across sectors, and the efficiency of the resource allocation within sectors driven both by reallocation amongst existing plants and by entry and exit; and (ii) measure the change in the country's welfare resulting from changes in productivity, government spending, the terms of trade, and a country's international investment position. We apply this framework to the Argentine crisis of 2001 using a unique establishment level data-set and find that more than half of the roughly 10% decline in measured total factor productivity can be accounted for by deterioration in the allocation of resources both across and within sectors. We measure the decline in welfare to be on the order of one-quarter of one years GDP.

Urban Structure and Growth

Most economic activity occurs in cities. This creates a tension between local increasing returns, implied by the existence of cities, and aggregate constant returns, implied by balanced growth. To address this tension, we develop a theory of economic growth in an urban environment. We show that the urban structure is the margin that eliminates local increasing returns to yield constant returns to scale in the aggregate, which is sufficient to deliver balanced growth. In a multi-sector economy with specific factors and productivity shocks, the same mechanism leads to a city size distribution that is well described by a power distribution with coefficient one: Zipf's Law. Under certain assumptions our theory produces Zipf's Law exactly. More generally, it produces the systematic deviations from Zipf's Law observed in the data, including the under-representation of small cities and the absence of very large ones. In general, the model identifies the standard deviation of industry productivity shocks as the key parameter determining dispersion in the city size distribution. We present evidence that the relationship between the dispersion of city sizes and the variance of productivity shocks is consistent with the data.

Firm Size Dynamics in the Aggregate Economy

Why do firm growth and exit rates decline with size? What determines the size distribution of firms? This paper presents a theory of firm dynamics that simultaneously rationalizes the basic facts on firm growth, exit, and size distributions. The theory emphasizes the accumulation of industry specific human capital in response to industry specific productivity shocks. The theory implies that firm growth and exit rates should decline faster with size, and the size distribution should have thinner tails, in sectors that use human capital less intensively, or correspondingly, physical capital more intensively. In line with the theory, we document substantial sectoral heterogeneity in US firm dynamics and firm size distributions, which is well explained by variation in physical capital intensities.

Experimental Potentials for the XΣ+2 and AΠ2 States of NaHe

Experimental potentials for the XΣ+2 and AΠ2 states of the NaHe molecule are presented. The potentials are generated from the temperature dependence of the red wing of the Na resonance line perturbed by He. For the AΠ2 state an unexpectedly large value is obtained for De=480(50) cm−1at Re=4.4(2)a0. The physical basis for this result, which indicates an important role for the internal structure of the rare gas in determining the repulsive part of the alkali-rare-gas interaction, is discussed

Do countries default in “bad times”?

This paper uses a new dataset to study the relationship between economic output and sovereign default for the period 1820-2004. We find a negative but surprisingly weak relationship between output and default. Throughout history, countries have indeed defaulted during bad times (when output was relatively low), but they have also maintained debt service in the face of severe adverse shocks, and they have defaulted when domestic economic conditions were favorable. We show that this constitutes a puzzle for standard theories, which predict a much tighter negative relationship as default provides partial insurance against declines in output.Default (Finance) ; Debt