Subsampling Variance Estimation for Non-stationary Spatial Lattice Data

ABSTRACT.  Most proposed subsampling and resampling methods in the literature assume stationary data. In many empirical applications, however, the hypothesis of stationarity can easily be rejected. In this paper, we demonstrate that moment and variance estimators based on the subsampling methodology can also be employed for different types of non-stationarity data. Consistency of estimators are demonstrated under mild moment and mixing conditions. Rates of convergence are provided, giving guidance for the appropriate choice of subshape size. Results from a small simulation study on finite-sample properties are also reported.     

Commodities,merchants, and refugees: inter‐Asian circulations and Afghan mobility

This article consists of an analysis of ethnographic material on Afghan trading networks involved in both the export of commodities from China to a variety of settings across Eurasia and the movement of ‘refugees’ from Afghanistan to Europe. Much recent work on trading networks has deployed the concept of trust to understand the functioning of such social formations. By contrast, in this article I assess the durability of Afghan networks in three ways. First, recognition of how they are polycentric and multi‐nodal. Second, how they are successful in transforming their collective aims and projects in changing shifting political and economic circumstances. Third, how they are made up of individuals able to switch their statuses and activities within trading networks over time. Furthermore, I argue that a focus on the precise ways in which traders entrust capital, people and commodities to one another, reveals the extent to which social and commercial relationships inside trading networks are frequently impermanent and pregnant with concerns about mistrust and contingency. Recognition of this suggests that scholars should focus on practices of entrustment rather than abstract notions of trust in their analyses of trading networks per se, as well as seek to understand the ways in which these practices enable actors to handle and address questions of contingency.     

Introduction to the special issue: after trust

‘Trust’ has long been seen as critical to the success and durability of trading networks, and conceptualized as a positive moral sentiment that is embedded in shared kinship, ethnicity or friendship, or in shared frameworks of morality. Other recent studies of business communities suggest that the ability to work in settings characterized by pervasive mistrust is a key factor in the development of commercial acumen and a determinant of success. Here, the authors argue that a focus on trust and mistrust, and an underlying concern with ethics and morality, can obscure equally critical factors that inform the durability of trading networks. They offer ethnographic accounts of different inter‐Asian trading networks active in the city of Yiwu, which is one of China's most dynamic and diverse ‘international trade cities’. Yiwu is home to the largest wholesale market of small commodities in the world, and attracts traders and merchants from across the planet; more than 12,000 foreign traders are also resident in the city. The authors of the articles presented here analyse the durability of these networks in relation to broader geopolitical processes and contexts. They argue that success often depends on the ability to negotiate geopolitical shifts and the fault lines of political identity. They trace traders’ efforts to create institutions that allow them to withstand geopolitical transformations. They also document the ability of trading networks to operate flexibly across different social fields, showing that resilience often depends on the ability to navigate and profit from shifting relations between economic, political and familial domains.