Relocation Patterns Research Articles

Equilibrium Supply-Demand Allocation in a Single-Commodity Network

This paper is devoted to the recent findings in the analytical research of supply-demand allocation in a single-commodity network with distant (in space) suppliers and consumers. The allocation problem is formulated as an equilibrium flow assignment problem with affine functions of demand, supply, and logistic costs in a network represented by a digraph with suppliers and consumers located in nodes. We offer a brief overview of supply-demand relocation patterns obtained for elastic, shortage, and overproduction cases. Such kinds of results seem valuable since they allow one to develop different competitive distribution models to facilitate the decisionmaking of supply chain managers. In particular, supply chain managers can use available patterns to design decision-making strategies that mitigate risks concerning disruption or ripple effects.

Fluid Nest Membership Drives Variable Relatedness in Groups of a Facultatively Social Bee

Kin selection theory has dominated our understanding of the evolution of group living. However, many animal groups form among non-relatives, which gain no indirect fitness benefits from cooperating with nestmates. In this study, we characterized the relatedness and inter-nest migration behavior of the facultatively social carpenter bee, Xylocopa sonorina. Nesting constraints due to costly nest construction in this species give rise to intense intraspecific competition over access to existing nests. We used mark-recapture techniques to characterize patterns of dispersal and nest relocation within a nesting aggregation of spatially clustered nests. Two-thirds of bees relocated at least once during the reproductive season, likely to seek reproductive opportunities in another nest. This fluid nest membership creates opportunities for association among non-relatives. To assess the effects of this dynamic nesting behavior on group relatedness, we used microsatellite analysis to estimate relative relatedness within and between nests in the aggregation. We found that relatedness was variable across sampling years, but that in many cases nestmates were no more related to one another than they were to non-nestmate bees in the population. Together, these results suggest that group composition in X. sonorina may result from strategies to maximize direct fitness. This study supports the hypothesis that factors beyond kinship, such as ecological constraints, are likely to drive group formation in this species.

Regional Spatial Structure and Land Use: Evidence from Bogotá and 17 Municipalities

The expansion of urban areas and the growth of the urban population are challenges faced by different territorial administrations across the world. In this context, the objective of this document is to analyze land occupation and the distribution of land uses in Bogotá and 17 municipalities. Therefore, a methodology is proposed in which an accessibility indicator models the spatial structure of the territory based on employment concentrations (the sum of the number of jobs weighted by the distance between each pair of municipalities). Then, the analysis of land use is carried out using a multinomial model, with the accessibility indicator as its principal explanatory variable. In such a way, it is possible to estimate the effects associated with the location decisions of economic agents in the territory. The results will enable policy makers to identify location and relocation patterns; we found evidence of a greater probability of commercial uses within urban areas and a relocation of industrial activity towards rural areas in some municipalities.

On Perspective and Possibility in Mediterranean History

Transnational patriotism widens our understanding of the Mediterranean and the interactions and entanglements that constituted its social and political landscapes at a conjuncture of great transformation. Zanou's anti-teleological reading of early nineteenth-century intellectual mobility challenges hegemonic frameworks of the nation-state that obscure her book's protagonists in national historiographies. The perspective of the Ionian and Dalmatian characters (to simplify the complex array of languages of expression and locations of origin) retells in compelling fashion the history of modernity's possibilities and contributes to a growing body of scholarship on these Adriatic worlds. Zanou takes the reader on a journey beyond the sea's shores and into various hinterlands, but we also travel beyond ideas about exchange and interaction that insist upon port cities as primary nodes in regional connectivity. That geographical framework has come to dominate much of the recent historiography in and of the Mediterranean and, in Zanou's book, we learn how invariably intertwined are patterns of social and political relocation. She illustrates how ‘patria’ and belonging are at the centre of these mercurial intellectual circles, but that their definitions do not conform to ex post facto renderings imposed by the social and political containers of the nation-state. In focusing on this transformative conjuncture of meaning which defines the transition from early modern to modern worlds, Transnational patriotism is a welcome addition to the historiography of the Mediterranean.

Recent Relocation Patterns Among Older Adults in the United States

Problem, research strategy, and findings Residential relocation is a way for older adults to cope with income changes, health changes, and other life cycle events such as the loss of a partner. The number of movers aged 60 and older increased by 1.4 million from 2010 to 2019 in the United States. Therefore, it is timely to examine older adults’ recent relocation patterns. Using multiple national-level data sources, we asked two questions: First, who are movers among older adults, and why are they moving? Second, what are their destination regions and neighborhoods? Results show that movers tend to be renters, those with lower incomes, those with higher housing cost burdens, and those who live alone. Although older adults’ primary reason for relocation is to live closer to their families, baby boomers younger than 70 have more heterogeneous moving reasons than older cohorts. We classify older adult movers into three types: aging adapters (56.9% of movers), suburb lovers (37.5% of movers), and long-distance movers (5.6% of movers). Takeaway for practice Our findings suggest short- and long-term strategies for planners to help older adults meet their heterogeneous residential needs. Practitioners should take steps to increase housing affordability for older adults, such as through changes in land use controls, by creating more age-restricted and age-inclusive communities to accommodate the diverse needs of movers among older adults, and by promoting age-friendly ride-hailing and public transit systems.

Flocking to the crowd: Cultural entrepreneur mobility guided by homophily, market size, or amenities?

Economic activity and innovation clusters in urban areas. Urban economics points to important knowledge and productivity spillovers in cities, in addition to other factors like thicker markets, lower transportation costs, and consumptive amenities. Yet thus far little work has analyzed how these different factors drive migration decisions of arts-related entrepreneurs, especially when they work in online platforms for fundraising. We use data on the largest US crowdfunding platform to identify relocating creators, allowing us to identify which kinds of regions are attracting and retaining more of this sort of talent. We test for the influence of clustering based on homophily, migration to larger markets, and relocation toward particular geographic amenities. Overall we find the strongest evidence for homophily and some distinct tendencies favoring certain regional amenities. Importantly, we both identify general relocation patterns among crowdfunding creatives and break down the attracting features for different types of creators. An examination of (net) migration by different categories of projects, such as musicians or filmmakers, reveals important heterogeneity in the attractors. For example, musicians are drawn stronger music sectors, while writers seek more isolation from other writers. This helps inform the interregional competition for talent and “creative class,” especially among a group of relatively footloose arts- and culture-intensive entrepreneurs.

Contrasting Patterns of Gene Duplication, Relocation, and Selection Among Human Taste Genes.

In humans, taste genes are responsible for perceiving at least 5 different taste qualities. Human taste genes’ evolutionary mechanisms need to be explored. We compiled a list of 69 human taste-related genes and divided them into 7 functional groups. We carried out comparative genomic and evolutionary analyses for these taste genes based on 8 vertebrate species. We found that relative to other groups of human taste genes, human TAS2R genes have a higher proportion of tandem duplicates, suggesting that tandem duplications have contributed significantly to the expansion of the human TAS2R gene family. Human TAS2R genes tend to have fewer collinear genes in outgroup species and evolve faster, suggesting that human TAS2R genes have experienced more gene relocations. Moreover, human TAS2R genes tend to be under more relaxed purifying selection than other genes. Our study sheds new insights into diverse and contrasting evolutionary patterns among human taste genes.

Moving for Diversity or Moving for the Kids? The Micro-Dynamics of Residential Relocations During Family Formation of Immigrants and Natives.

Family formation is a crucial event in the life course and generates a major part of residential relocations. After family formation, neighborhoods become re-evaluated, now as contexts for children's development and socialization. We argue that the perceived or assumed quality of schools and neighborhoods is an important condition of choosing a destination. However, as the literature on “ethnic colonies” and immigrant-native residential segregation suggests, immigrants differ from natives in their neighborhood preferences and relocation patterns. If relocations of migrant and native families to particular destinations do indeed occur basically during family formation and family enhancement, and if they are at the same time outcomes of different preferences, the micro-dynamics of young families' adaptation of housing conditions might have a considerable impact on segregation. Results of our ordered Heckman probit and event history models show that on the one hand, immigrants and natives tend to different evaluations of characteristics in their neighborhoods. Particularly respondents of Turkish, Arabic or African origin highly appreciate living nearby a house of worship and also with many Non-Germans. On the other hand, our analysis of how these evaluations transform into residential relocations did not show any differences between immigrants and natives. Results thus suggest that evaluations or preferences during family formation do not trigger relocations which result in “ethnic colonies” at the macro level.

Incentives and Firm Migration: An Interstate Comparison Approach

The authors model how state business incentives influence interstate relocation patterns of manufacturers using a panel (2000-2011) of 32 states. The National Establishment Time Series database and the Panel Database on Incentives and Taxes are used to study relocation by manufacturing establishments based on differences between the origin and destination states. The authors find that traditional factors associated with business climate, such as taxation and subsidies, statistically influence manufacturing interstate relocation. Further analysis shows that policy changes (e.g., increasing incentives and reducing taxes) to induce manufacturers to relocate may need to be infeasibly large or used in combination to evoke an economically meaningful increase in relocations.

The January 23, 2018 M7.9 Kodiak earthquake, Alaska: A consequence of slip partitioning in the outer rise region

The January 23, 2018 M7.9 earthquake ruptured conjugate set of strike-slip faults in the outer rise of the Alaska subduction zone, southeast of Kodiak Island. The complex nature of this earthquake is evident from the earthquake focal mechanism and aftershock relocation patterns which revealed rupture of multiple north-south and east-west trending conjugate fault planes. Here, we suggest that this earthquake occurred as a result of two different modes of interaction process. The stress triggering process reveals (i) the co-seismic and post-seismic deformation of the M9.2 1964 Alaska megathrust earthquake increased Coulomb failure stress of ∼10 kPa and ∼0.05 kPa respectively in the 2018 Kodiak earthquake source region, and (ii) the overall deformation is being accommodated in the outer rise region due to slip partitioning resulting from the oblique convergence between the Pacific and North American plates along the Alaska Aleutian megathrust.

Local alliances in rural urbanization: Land transfer in contemporary China

The relocation of peasants to high-rise buildings is the latest strategy deployed to feed the insatiable hunger for land in China. To free up more land for construction, Chinese peasants are encouraged to abandon their traditional homes and move into newly built high-rise modern apartments. A central feature of this distinctive form of rural urbanization is the transferability of land development rights across the rural–urban divide. Like most policy initiatives in Chinese economic reforms, variations and improvisation in implementation are found across local administrations. Such local disparities carry major implications for rural governance. This article compares and evaluates the experience of local governments in Chongqing and Nantong. Local governments in these two localities face both opportunities and constraints in integrated urban–rural development, a situation which has contributed to contrasting relocation patterns, and consequently variations in intergovernmental relationships at local levels. Enjoying the privilege of experimenting with the ‘land bill’ (地票) system, local governments in Chongqing have more leeway to stake their claims and are thus in a better position to maintain their authority. In the Nantong case, however, the more hands-on approach of the prefecture deprives lower administrative levels of flexibility to pursue their interests. This contrast in the policy process leads to different patterns of collaboration between levels of government at the grass roots in the two localities, which may also have a long-term impact on the exercise of authority at the community level.

Homophily horizons and ethnic mover flows among homeowners in Scotland

This article analyses mover flows in Glasgow and the role of ethnic homophily, the tendency for movers to be drawn to areas with similar ethnicities to their own. We look at how homophily affects the spatial relocation patterns of homeowners in Glasgow from Scottish, Indian, Pakistani and Chinese descent, and focus on the extent to which homophily extends beyond the immediate locality to surrounding neighbourhoods. Our interest is in estimating the “homophily horizon” – how far the gaze of homophily reaches in mover location decisions. Using a simple Schelling-type theoretical model, we argue that homophily horizons are potentially important in shaping the long-term social structure of cities as they may profoundly affect how potent the overall sorting tendencies of the housing market are in driving segregation. In principle, the more distant the homophily horizon, the more quickly the housing market will tend towards segregation, other things being equal. We adopt Folch and Rey’s use of the local centralization index to capture the influence of surrounding neighbourhoods in shaping mover flows and neighbourhood dynamics. Our estimation combines ethnic mover flows derived from surname analysis of house buyers from the house transactions recorded in Registers of Scotland data. Our results show that the presence of the own ethnic group in the local surroundings is important for explaining mover flows, and that homophily is a local phenomenon.

Environmental regulation and the Pollution Haven Hypothesis: Do environmental regulation measures matter?

This paper examines the how new manufacturing firms choose locations in response to the environmental regulations in Jiangsu, China. In particular, we utilize three representative measures of the environmental regulations to test the consistence of the Pollution Haven Hypothesis (PHH). The dramatic results indicate that different measures of environmental regulation lead to different conclusions of the PHH. However, firms' relocation patterns are common and consistent, i.e., new polluting firms are more likely to be driven by the government environmental mandates to northern Jiangsu, where the pollution abatement cost is high. This pattern is consistent with the industrial planning of the province, suggesting that local government may use environmental regulations to achieve economic objectives. More comprehensive and equitable policy design is thus recommended to address the problems of environmental equity in China.

The Political Geography of Rebellion: Using Event Data to Identify Insurgent Territory, Preferences, and Relocation Patterns

The Political Geography of Rebellion: Using Event Data to Identify Insurgent Territory, Preferences, and Relocation Patterns

Exploring changes in the spatial distribution of the low-to-moderate income group using transit smart card data

Property booms have caused residential spatial distribution changes in many metropolitan areas. To understand the impact of surging housing prices on the low-to-moderate income group, this study uses transit smart card data to explore whether and to what extent increasing housing affordability pressure impacts the pattern of residential spatial distribution. This analysis is based on the facts that most public transit commuters are in the low-to-moderate income group and that transit smart cards continuously record individual spatial choice behaviors. Compared with conventional approaches using census data or survey data, our approach can more quickly detect residential changes. Experimental results indicated that most low-to-moderate income dwellers lived in low-housing-cost areas with high accessibility to public transportation. Three relocation patterns were discovered based on significant changes in residential spatial distribution. The overall pattern is to move from the inner city to suburban areas or to the urban periphery, where housing costs are much lower. Specifically, these commuters moved along traffic corridors (metro lines), which indicates that their residential choices were constrained by employment locations and public transport facilities. Finally, these commuters presented a jumping relocation pattern along metro lines due to the search for low-rent housing. Our findings provide some insights into urban dynamics, as well as urban and housing policies.

The Role of Relocation Patterns and Psychosocial Stressors in Posttraumatic Stress Disorder and Depression Among Earthquake Survivors.

The psychological impact of relocation within and outside of a disaster region was examined in 541 survivors of the 2011 Van earthquake in Turkey at 16.5 months postdisaster. Relocation out of the region was determined by disaster-related property/financial losses and fear during the earthquake. Anticipatory fear of future earthquakes and less sense of control over life were the strongest predictors of posttraumatic stress disorder (PTSD) and depression symptoms. Relocation within the disaster region predicted PTSD but not depression. Dissatisfaction with emotional support received from close ones was significantly associated with depression, but it was associated with PTSD at a marginally significant level. Survivors who experienced more intense fear during the earthquake displayed higher levels of anticipatory fear in the long term, whereas avoidance of trauma reminders and fear-evoking situations sustained anticipatory fear of future earthquakes. These findings suggest that interventions that reduce fear and avoidance behaviors would help survivors overcome traumatic stress and depressive symptoms.

Relocation of manufacturing industry from the perspective of transport accessibility – An application of percolation theory

Industrial relocation patterns has become one of the central issues for sustainable development of economics. In order to analyze the relocation patterns of manufacturing industries from the perspective of transport accessibility, this study took the electronic and information industry in the Yangtze River Economic Belt as an example to analyze the relocation patterns of manufacturing industries in China. Considering the transportation factors and economic factors, a topological network of Yangtze River Economic Belt was constructed. Based on this network, the relocation patterns of manufacturing industry both at present and in the planning period were analyzed by percolation theory. And results show that: first, percolation transitions exists during the process of industry relocation. Cities located in border regions are the bottlenecks for industry relocation. Second, both improvements in transport accessibilities and increase of production costs accelerate the process of industrial relocation in “fly-in” mode. Finally, preferential policies are needed for provinces in the upper reaches Yangtze River Economic Belt to attract industrial relocation.

The impact of carbon emission costs on manufacturers' production and location decision

This paper investigates how emerging carbon emission costs may affect the joint production and location decisions for a manufacturer across the world's regions. Specifically, we develop a new theoretical model which explicitly links product demand, production costs and carbon emission levels to location decisions, and investigate the manufacturer's optimal decisions between two distinct regions. The results show that the influence of carbon emissions on manufacturers' decisions can vary greatly under different circumstances: both off-shoring and near-shoring are possible under rising carbon emission costs; manufacturers with high or low demand have different tolerance levels to the rising carbon emission costs when considering an alternative location; trade costs can change the pattern of relocation. To gain policy insights for those who pursue reducing carbon emissions, different product examples are used to calculate the critical carbon price which triggers different location choices. The results suggest that if production technology is stable, raising carbon cost itself has only limited effects on reducing total carbon emissions, especially for high-value-low-emission industries. The location shift, which is more sensitive to changes in variable carbon emissions, may lead to a significant emission reduction when completed. Additional pricing decision from the manufacturer shows no significant effect on the location decisions; however, if demand is linked directly to carbon emission footprint of the product, then it is more hopeful that a raised carbon price would reduce the carbon emissions significantly through relocation.

Potential relocation of climatic environments suggests high rates of climate displacement within the North American protection network.

Ongoing climate change may undermine the effectiveness of protected area networks in preserving the set of biotic components and ecological processes they harbor, thereby jeopardizing their conservation capacity into the future. Metrics of climate change, particularly rates and spatial patterns of climatic alteration, can help assess potential threats. Here, we perform a continent-wide climate change vulnerability assessment whereby we compare the baseline climate of the protected area network in North America (Canada, United States, México-NAM) to the projected end-of-century climate (2071-2100). We estimated the projected pace at which climatic conditions may redistribute across NAM (i.e., climate velocity), and identified future nearest climate analogs to quantify patterns of climate relocation within, among, and outside protected areas. Also, we interpret climatic relocation patterns in terms of associated land-cover types. Our analysis suggests that the conservation capacity of the NAM protection network is likely to be severely compromised by a changing climate. The majority of protected areas (~80%) might be exposed to high rates of climate displacement that could promote important shifts in species abundance or distribution. A small fraction of protected areas (<10%) could be critical for future conservation plans, as they will host climates that represent analogs of conditions currently characterizing almost a fifth of the protected areas across NAM. However, the majority of nearest climatic analogs for protected areas are in nonprotected locations. Therefore, unprotected landscapes could pose additional threats, beyond climate forcing itself, as sensitive biota may have to migrate farther than what is prescribed by the climate velocity to reach a protected area destination. To mitigate future threats to the conservation capacity of the NAM protected area network, conservation plans will need to capitalize on opportunities provided by the existing availability of natural land-cover types outside the current network of NAM protected areas.

Relocation of Obstetrician-Gynecologists in the United States, 2005-2015.

To examine recent trends in the relocation of obstetrician-gynecologists (ob-gyns) in the United States. This longitudinal descriptive study analyzed relocation patterns of ob-gyns between the earliest reference point (2005) and most recently (2015). A physician's county location in a year was compared with his or her location during the previous year. Physician background and county characteristics came from three data resources (Association of American Medical Colleges databases, American Medical Association Physician Masterfile, American Community Survey). A multilevel logistic regression model was used to model factors associated with relocation for the entire period. An average of 2,446 (6.5%) of the 37,385 ob-gyns in practice moved per year. Approximately one third (32.1%) relocated (usually once or twice) during the 10 years with more than half (58.2%) remaining within their state. The odds of relocating were higher if the ob-gyns was young, male, black, or an international medical graduate. Relocations were predominantly to counties that were either urban or with a lower percentage of the population in poverty (less than 21.2%). Although the number of ob-gyns and women 18 years or older increased in most states, the population to ob-gyn ratio increased from 3,155 in 2006 to 3,293 in 2015. Net gains from relocations were most apparent in Florida, California, and Washington, whereas net losses were especially apparent in Michigan, Pennsylvania, Ohio, Illinois, and New York. Approximately one in every three ob-gyns in the United States moved at least once in the past 10 years to counties that were predominantly urban or with less poverty. Observing this trend might contribute to a better understanding about the uneven national distribution of ob-gyns.