A MODULARITY DECOMPOSITION MODEL OF EVOLVING INPUT-OUTPUT SECTORIAL STRUCTURE

Dimitrios Tsiotas (), Elias Giannakis () and Christos Papadas ()
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Dimitrios Tsiotas: Assistant Professor, Department of Regional and Economic Development, School of Applied Economics and Social Sciences, Agricultural University of Athens, Neo Ktirio – Nea Poli, 33100, Amfissa (Phocis), Greece
Elias Giannakis: Assistant Professor, Department of Agricultural Economics and Rural Development, School of Applied Economics and Social Sciences, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
Christos Papadas: Professor, Department of Agricultural Economics and Rural Development, School of Applied Economics and Social Sciences, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece

Regional Science Inquiry, 2025, vol. XVII, issue 1, 107-133

Abstract: This paper builds on the network paradigm to model the evolving input-output (IO) economic structure of Greece into a multiplex network (GION) and unveils structural changes during the period 2005-2015, with reference to the 2008 economic crisis. The results illustrate that the GION resembles to a composition of windmill graphs, it is more clustered at the neighborhood scale, with a tertiary sectorial orientation, a solid performance of the trade and transportation industries, inelastic demand in energy-related economic activities, a neutral profile in communication and manufacturing relevant activities, insufficient connectedness of education, and vulnerable in the construction-related economic activities and the public sector. A major finding describes that the tourism industry is dynamic more due to its dependence on the supportive economies than the intrinsic industrial productivity. The time-series and community detection analysis provide insights into distinguishing three stages in the GION’s evolution: the pre-crisis period (2005-2007), with a centralized topology in terms of outgoing connectivity and degree inequalities; the on-crisis period (2008-2010), with a decentralized topology and a tendency to reduce degree inequalities; and the post-crisis period (2011-2015), with a new state of centralized topology illustrating a recovery process. The analysis also reveals a diversified configuration in the Greek economy compared to the three-sector classical breakdown, composed of “tourism” and “transportation and energy” sector-like components, and the traditional secondary and tertiary sectors. Overall, the analysis shapes a “balloon” waiving pattern in the network evolution and reveals solid and fragment-favorable economic interactions in the GION’s structure, promoting network analysis to the input-output structural modeling.

Keywords: input-output networks; structural analysis; community detection; economic crisis; Greece (search for similar items in EconPapers)
JEL-codes: R00 R15 (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:hrs:journl:v:xvii:y:2025:i:1:p:107-133

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