Spatial Typology of the Functional Structure of the Tehran–Alborz Metropolitan Region Based on the Boudeville Approach and Its Implications for Future-Oriented Planning

A B S T R A C T
Structural transformations in regional economies and the spatial redistribution of activities represent key manifestations of the dynamism of contemporary urban regional systems. In recent decades, the Tehran–Alborz metropolitan region has experienced notable changes in the spatial organization of activities under the influence of capital concentration, the expansion of advanced services, and the development of technology and communication networks. These processes have simultaneously intensified the concentration of certain activities while generating emerging patterns of specialization, economic diversification, and peripheralization across counties. Consequently, identifying comparative advantages and analyzing spatial patterns of activities is essential for forward‑looking regional development.This study adopts Budville’s quantitative approach to develop a spatial typology of the regional activity structure and to interpret its implications for futures-oriented regional analysis. Value-added data for the period 2016–2021 across nine economic sectors were examined. Using a combined analysis of Location Quotient and Shift–Share, counties were classified into three structural types—specialized, diversified, and peripheral—in order to evaluate the alignment between economic potentials and infrastructural capacities.The results reveal considerable spatial heterogeneity in the regional activity structure. While some counties act as development drivers due to specialized activities and competitive advantages, others remain in peripheral positions because of limited economic diversification. Therefore, achieving a balanced relationship between economic capacities and infrastructural resources is essential for guiding the region toward a more coherent spatial development trajectory.
Extended Abstract
Introduction
The spatial organization of activity zones in metropolitan regions plays a decisive role in shaping regional competitiveness, territorial balance, and sustainable development trajectories. In recent decades, the Tehran–Alborz Metropolitan Region has experienced extensive spatial concentration of population, economic activities, and strategic services, resulting in increasing spatial imbalance, functional inefficiency, environmental pressures, and unequal regional development. The dominant pattern of spatial development in this metropolitan region has largely been influenced by centralized growth dynamics and uneven distribution of economic opportunities, leading to the concentration of high-order activities within limited urban cores while peripheral areas remain structurally dependent and functionally underutilized. Such conditions have intensified regional disparities and reduced the capacity for integrated metropolitan governance.In contemporary regional planning literature, the reorganization of spatial activity patterns based on relative and competitive advantages has emerged as a fundamental approach for achieving balanced spatial development and enhancing regional resilience. Relative advantages reflect the inherent capacities and territorial potentials of places, whereas competitive advantages are associated with innovation capacity, agglomeration economies, accessibility, infrastructure, and institutional performance. Identifying the spatial manifestations of these advantages can therefore provide a strategic basis for restructuring the spatial distribution of activities and improving metropolitan efficiency.The present study aims to analyze and reorganize the spatial development pattern of activity zones in the Tehran–Alborz Metropolitan Region based on relative and competitive advantages. The main research questions are: What are the spatial manifestations of relative and competitive advantages in the Tehran–Alborz Metropolitan Region? To what extent does the current spatial distribution of activity zones correspond with these advantages? And how can a more balanced and future-oriented spatial development pattern be proposed for the region?
 
Methodology
This research adopts an applied-developmental approach and employs a combination of descriptive-analytical and spatial analysis methods. The study area includes the Tehran–Alborz Metropolitan Region as one of the most influential urban-regional systems in Iran. The analytical framework of the research is grounded in theories of regional competitiveness, spatial planning, and futures-oriented regional development. In order to identify the spatial structure of activity zones and evaluate their relationship with territorial advantages, both quantitative and qualitative data were utilized.The research process consisted of several stages. First, indicators associated with relative and competitive advantages were identified through a review of theoretical literature and regional planning studies. These indicators included industrial specialization, accessibility networks, demographic capacity, employment concentration, service functions, infrastructure development, environmental potential, and innovation-related capacities. Subsequently, statistical and spatial data were collected from official documents, census data, regional development plans, and institutional reports.In the next stage, spatial analysis techniques and regional classification methods were employed to determine the distribution pattern of activity zones. The Budville approach was applied as an analytical framework for identifying spatial typologies and functional differentiation within the metropolitan region. Geographic Information System (GIS) tools were also used to visualize spatial patterns, analyze territorial disparities, and identify development corridors and concentrated activity clusters.
 
Results and discussion
The findings of the study indicate that the current spatial organization of activity zones in the Tehran–Alborz Metropolitan Region is characterized by a highly centralized and uneven structure. Economic activities, advanced services, administrative functions, and major infrastructural facilities are predominantly concentrated within Tehran and its immediate surrounding areas, while many peripheral zones exhibit limited functional diversity and lower economic competitiveness. This pattern has contributed to excessive commuting flows, inefficient land-use distribution, increased environmental stress, and unequal access to regional opportunities.The spatial analysis revealed that several areas within the metropolitan region possess substantial relative advantages in terms of industrial capacity, transportation accessibility, environmental resources, demographic potential, and strategic geographic location. However, these capacities have not been adequately integrated into the dominant spatial development structure. In many cases, the existing distribution of activities does not correspond with territorial potentials, resulting in spatial inefficiency and underutilization of regional capabilities.The application of the Budville approach demonstrated distinct spatial typologies across the region. Certain zones function as dominant growth poles with high levels of economic concentration and service centrality, whereas other areas display emerging development capacities that remain insufficiently supported by planning policies and infrastructural investment. The findings further suggest that the continuation of monocentric development patterns may intensify regional imbalance and reduce long-term metropolitan sustainability.
 
Conclusion
The reorganization of spatial activity patterns based on relative and competitive advantages represents a strategic necessity for achieving balanced and sustainable development in the Tehran–Alborz Metropolitan Region. The findings of this study demonstrate that the existing spatial structure is not fully compatible with the territorial capacities and developmental potentials of different areas within the region. The concentration of major activities in limited central zones has generated considerable spatial inequalities and functional inefficiencies.Accordingly, the study proposes a spatial development approach centered on polycentric organization, regional complementarity, and strategic utilization of territorial advantages. The integration of spatial planning policies with regional competitiveness strategies can facilitate a more coherent and efficient metropolitan development trajectory. Furthermore, adopting a futures-oriented perspective allows planners and policymakers to anticipate emerging spatial challenges and formulate adaptive regional development strategies.Ultimately, the research highlights the importance of spatial typology, territorial differentiation, and strategic planning in guiding the future development of metropolitan regions in Iran. The proposed framework can also serve as a conceptual and practical basis for regional planning studies in other metropolitan areas facing similar spatial imbalances.
 
Funding
There is no funding support.
 
Authors’ Contribution
The first author contributed to the study’s conceptualization, data analysis, and manuscript editing.
The second author contributed to study design, data collection, initial drafting, and preparation of tables and references.
 
Conflict of Interest
Authors declared no conflict of interest.
 
Acknowledgments
We are grateful to all the scientific consultants of this paper.