{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,18]],"date-time":"2026-03-18T00:48:41Z","timestamp":1773794921273,"version":"3.50.1"},"reference-count":73,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2022,11,8]],"date-time":"2022-11-08T00:00:00Z","timestamp":1667865600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["41671158"],"award-info":[{"award-number":["41671158"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJGI"],"abstract":"<jats:p>The rapid development of the urban network has led to the fact that cities are no longer single individuals, and the network has changed the urban development environment. The interaction between cities has gradually become an important factor for the high-quality development (HQD) of cities. From the perspective of externalities, it is of great significance to explore the impact of agglomeration externalities and network externalities on the HQD of cities to promote the high-quality and sustainable development of the region. Taking the urban agglomeration in the middle reaches of the Yangtze River as an example, this study constructs a theoretical framework to empirically study the influence of agglomeration externalities and network externalities on the HQD of the city. The results show that the integrated network of the urban agglomeration from 2011 to 2020 had a high clustering coefficient and a small average path length with the characteristics of a \u201csmall world\u201d. The centrality of urban nodes was hierarchical and had a \u201cpyramid\u201d structure. From 2011 to 2020, the high-quality development level (HQDL) of the urban agglomeration steadily improved and the regional \u201cdevelopment gap\u201d gradually narrowed. Wuhan, Changsha, and Nanchang were in a relatively advantageous position in the urban agglomeration. Furthermore, there was a spatial agglomeration effect and a spatial spillover effect in the HQD of urban agglomeration. Network externalities presented difference in different cities, and the influence of agglomeration externalities on HQD presented a u-shaped nonlinear relationship. Network externalities could significantly promote HQD, and the indirect effect of HQD was greater than its direct effect. In addition, factors such as government capacity and level of opening to the outside world also had a significant impact on the HQD of the region.<\/jats:p>","DOI":"10.3390\/ijgi11110555","type":"journal-article","created":{"date-parts":[[2022,11,9]],"date-time":"2022-11-09T02:34:52Z","timestamp":1667961292000},"page":"555","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Agglomeration Externalities, Network Externalities and Urban High-Quality Development: A Case Study of Urban Agglomeration in the Middle Reaches of the Yangtze River"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2085-3970","authenticated-orcid":false,"given":"He","family":"Liu","sequence":"first","affiliation":[{"name":"Geographical Sciences School, Liaoning Normal University, Dalian 116029, China"}]},{"given":"Xueming","family":"Li","sequence":"additional","affiliation":[{"name":"Geographical Sciences School, Liaoning Normal University, Dalian 116029, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5686-1550","authenticated-orcid":false,"given":"Songbo","family":"Li","sequence":"additional","affiliation":[{"name":"Teachers College, Shenyang University, Shenyang 110044, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6898-8794","authenticated-orcid":false,"given":"Shenzhen","family":"Tian","sequence":"additional","affiliation":[{"name":"Geographical Sciences School, Liaoning Normal University, Dalian 116029, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2877-3959","authenticated-orcid":false,"given":"Yilu","family":"Gong","sequence":"additional","affiliation":[{"name":"Art and Design School, Dalian Polytechnic University, Dalian 116034, China"}]},{"given":"Yingying","family":"Guan","sequence":"additional","affiliation":[{"name":"School of Resource and Environmental Sciences, Quanzhou Normal University, Quanzhou 362000, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0646-8961","authenticated-orcid":false,"given":"He","family":"Sun","sequence":"additional","affiliation":[{"name":"National Marine Environmental Monitoring Center, Dalian 116023, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"100846","DOI":"10.1016\/j.seps.2020.100846","article-title":"Do high-speed railways accelerate urban land expansion in China? 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