Rushing for Gold: Mobility and Small‐Scale Mining in East Africa

African rural dwellers have faced depressed economic prospects for several decades. Now, in a number of mineral‐rich countries, multiple discoveries of gold and precious stones have attracted large numbers of prospective small‐scale miners. While their ‘rush’ to, and activities within, mining sites are increasingly being noted, there is little analysis of miners' mobility patterns and material outcomes. In this article, on the basis of a sample survey and interviews at two gold‐mining sites in Tanzania, we probe when and why miners leave one site in favour of another. Our findings indicate that movement is often ‘rushed’ but rarely rash. Whereas movement to the first site may be an adventure, movement to subsequent sites is calculated with knowledge of the many risks entailed. Miners spend considerable time at each site before migrating onwards. Those with the highest site mobility tend to be more affluent than the others, suggesting that movement can be rewarding for those willing to ‘try their luck’ with the hard work and social networking demands of mining another site.     

The religious politics of prophecy: Or, Richard Brothers's Revealed Knowledge confuted

The messianic messages delivered to Londoners by the self-styled prophet, Richard Brothers, were regarded by many sceptical observers and pamphleteers as eccentric or, worse still, the embarrassing utterances of someone wishing to reprise the political turmoil of a by-gone era marred by religious ‘fanaticism’. This article shows the extent to which Brothers's messages, as set down in his Revealed Knowledge of the Prophecies and Times (1794–1795), were absolutely central to the religious politics and culture of the 1790s—or what one contemporary critic mockingly referred to as the ‘age of prophecy’. Brothers's prophecies came to the attention of the British government, which culminated in his arrest for treasonable practices in March 1795 when he became a cause célèbre, before being confined to an asylum for eleven years. He was deemed a criminal lunatic but, as this article seeks to demonstrate, his ‘prophetic imagination’ arose out of the same rich theological, political and cultural context that spurred ‘radicals’ like Tom Paine, whilst inspiring poets and artists such as William Blake. If the content of his prophecies were regarded by contemporary sceptics for having no validity, it remains true to say that Richard Brothers, as an educated gentleman and naval officer, dramatically altered 18th-century expectations and perceptions of what prophets were and the nature of prophecy itself.     

Hub-and-Spoke Networks in Air Transportation: An Analytical Review

In this review we survey advances in analysis of the hub location problem and its variants. In the course of the review opportunities for enhanced analysis become apparent. We emphasize the most pressing areas for further work. We found that first, research needs to be devoted to developing more reliable heuristics for the multiple assignment model and its extensions and second, that additional research is needed to understand the conditions under which the model will tend to have integer solutions. Research in this area will contribute to the solution of a longstanding puzzle in economics about the allocation of indivisible resources.     

Extensions to the Hub Location Problem: Formulations and Numerical Examples

Although a tremendous amount of analytical research is being conducted on the hub location problem, few models exist that extend the number of characteristics found in actual hub-and-spoke networks. Four extensions are presented in this paper: (1) a capacitated network model; (2) a minimum threshold model; (3) a model that endogenously determines the number of open hubs for the network; and (4) a model that incorporates a flow-dependent cost function for the spokes as well as the interhub links. Both the capacitated and the minimum threshold models drop the assumption of a completely interconnected network commonly found in hub location models. Numerical results show that total network costs are often minimized by closing a few interhub links. The third extension is the first known hub location model to determine the optimal number of hubs based on the needs of the network. In this model, the number of open hubs depends on the distribution of flows in the network and how cost effectively the flows can be moved across the network. Previous models that endogenously determined the number of open hubs utilized a fixed cost for establishing each hub in order to limit the number of hubs in the network. The final extension recognizes the potential of all links to amalgamate flows and includes a separate flow-dependent cost function for the spokes in addition to the one for the interhub links. Numerical results are shown for all four models.     

Teotihuacan

Teotihuacan in the northeastern Basin of Mexico was an unusually large and influential early city and state. This article reviews recent research trends in Teotihuacan from its founding and explosive growth ca. 100 BC into the largest city in Mesoamerica. Biogenetics provide details of how immigration fueled the city’s growth and shaped its multiethnic composition and link Teotihuacan to other parts of the central highlands and more distant regions. Urban theory highlights the importance of neighborhoods and how their composition changed. Collective aspects of irrigation, markets, warfare and the military, and ideology encouraged the development of Teotihuacan’s corporate governance. Although Teotihuacan politically dominated central Mexico, its control over the regional economy was not as centralized. Beyond its hinterland, Teotihuacan’s foreign relations were a mosaic of trade diasporas, diplomatic exchanges, pilgrimages, emulation, and strategic direct interventions of limited duration. As its foreign influence retracted, Teotihuacan faced challenges from its hinterlands and intermediate elites and factions that culminated in the burning and desecration of the urban center. The Epiclassic saw the change from Teotihuacan’s regional state to city-states and confederations. Although much reduced in size, Postclassic Teotihuacan retained an enormous legacy that subsequent states sought for their historical validation.