Intellectual Property and Regional Growth in Türkiye: A Spatial Analysis of Education, Trade, and Population Dynamics

Öz

This research investigates the determinants of regional economic growth in Türkiye between 2008 and 2023, focusing on GDP persistence, population density, trade openness, education, and intellectual property rights (IPRs), particularly patent, utility model, trademark, and industrial design registrations. Spatial panel data analysis with spatial autoregressive model (SAR), spatial durbin model (SDM), and spatial error model (SEM) is applied to 81 cities at the NUTS-III level, providing a comprehensive perspective on regional dynamics. The findings confirm statistically significant spatial autocorrelation, indicating that neighboring cities influence each other’s economic performance. GDP persistence and population density positively affect growth, while tertiary education negatively correlates with GDP. Trade openness is not statistically significant. Design and utility model registrations contribute positively to growth, whereas patents and trademarks show negative effects, highlighting the need for policy alignment with regional economic structures.

Anahtar Kelimeler

• Intellectual Property Rights
• Regional Economic Growth
• Education and Human Capital
• Spatial Panel Data Analysis
• Trade Openness

Kaynakça

1. Abay, M., Akgüngör, S., & Akyıldız, Y. T. (2021). Innovation, relatedness and complexity in Turkey: A regional analysis for 1978-2017. Ekonomi-tek, 10(3), 135-171. google scholar
2. Acemoglu, D., & Linn, J. (2004). Market size in innovation: Theory and evidence from the pharmaceutical industry. The Quarterly Journal of Economics, 119(3), 1049-1090. [https://doi.org/10.1162/0033553041502144](https://doi.org/10.1162/0033553041502144) google scholar
3. Acemoglu, D., & Restrepo, P. (2018). Artificial intelligence, automation, and work. Journal of Economic Perspectives, 33(2), 193-210. [http://www.nber.org/chapters/c14027](http://www.nber.org/chapters/c14027) google scholar
4. Acemoglu, D., & Zilibotti, F. (2001). Productivity differences. The Quarterly Journal of Economics, 116(2), 563-606. [https://doi.org/10.1162/00335530151144104](https://doi.org/10.1162/00335530151144104) google scholar
5. Aghion, P., & Howitt, P. (1992). A model of growth through creative destruction. Econometrica, 60(2), 323-351. [https://doi.org/10.2307/2951599](https://doi.org/10.2307/2951599) google scholar
6. Aghion, P., Akcigit, U., & Howitt, P. (2015). Lessons from Schumpeterian growth theory. American Economic Review, 105(5), 94-99. [https://doi.org/10.1257/aer.p20151067](https://doi.org/10.1257/aer.p20151067) google scholar
7. Aghion, P., Jones, B. F., & Jones, C. I. (2019). Artificial intelligence and economic growth. In A. Agrawal, J. Gans, & A. Goldfarb (Eds.), The economics of artificial intelligence (pp. 237-282). University of Chicago Press. [https://doi.org/10.7208/9780226613475-011](https://doi.org/10.7208/9780226613475-011) google scholar
8. Anselin, L. (1988). Spatial econometrics: Methods and models. Springer. google scholar

9. Arrow, K. J. (1962). Economic welfare and the allocation of resources for invention. In R. R. Nelson (Ed.), The rate and direction of inventive activity (pp. 609-626). Princeton University Press. google scholar
10. Bain, J. S. (1956). Barriers to new competition: Their character and consequences in manufacturing industries. Harvard University Press. google scholar
11. Baumol, W. J. (1982). Applied fairness theory and rationing policy. The American Economic Review, 72(4), 639-651. [suspicious link removed] google scholar
12. Bayarçelik, E. B., & Taşel, F. (2012). Research and development: Source of economic growth. Procedia-Social and Behavioral Sciences, 58, 744-753. [https://doi.org/10.1016/j.sbspro.2012.09.1052](https://doi.org/10.1016/j.sbspro.2012.09.1052) google scholar
13. Beebe, B., & Fromer, J. C. (2017). Are We Running Out of Trademarks: An Empirical Study of Trademark Depletion and Congestion. Harv. L. Rev., 131, 945. google scholar
14. Bidirici, M., & Bohur, E. (2015). Design and economic growth: Panel cointegration and causality analysis. Procedia-Social and Behavioral Sciences, 210, 193-202. [https://doi.org/10.1016/j.sbspro.2015.11.359](https://doi.org/10.1016/j.sbspro.2015.11.359) google scholar
15. Bielig, A. (2015). Intellectual property and economic development in Germany (1999–2009). Springer. [https://doi.org/10.1007/s10657-012-9324-5](https://doi.org/10.1007/s10657-012-9324-5) google scholar
16. Bloom, D. E., Canning, D., Chan, K., & Luca, D. L. (2014). Higher education and economic growth in Africa. International Journal of African Higher Education, 1(1). [https://doi.org/10.6017/ijahe.v1i1.5643](https://doi.org/10.6017/ijahe.v1i1.5643) google scholar
17. Bloom, N., Schankerman, M., & Van Reenen, J. (2013). Identifying technology spillovers and product market rivalry. Econometrica, 81(4), 1347-1393. [https://doi.org/10.3982/ECTA9466](https://doi.org/10.3982/ECTA9466) google scholar
18. Bozkaya, Ş.; Şen Küçük, G. & Aksel, E. (2020). “Ticari marka başvurularının ekonomik büyüme üzerine etkisi”, International Journal of Disciplines Economics & Administrative Scienves Studies, Vol:6, Issue:24; pp:841-849 [http://dx.doi.org/10.26728/ideas.346](http://dx.doi.org/10.26728/ideas.346) google scholar
19. Bulus, G. C., & Bakirtas, I. (2021). Patent, utility model, and economic growth. Innovation, Catch-up and Sustainable Development: A Schumpeterian Perspective, 309-335. [https://doi.org/10.1007/978-3-030-84931-3\_13](https://doi.org/10.1007/978-3-030-84931-3_13) google scholar
20. Chamberlin, E. H. (1933). The theory of monopolistic competition. Harvard University Press. google scholar
21. Chatterji, M. (1998). Tertiary education and economic growth. Regional Studies, 32(4), 349-354. [https://doi.org/10.1080/00343409850117807](https://doi.org/10.1080/00343409850117807) google scholar
22. Cliff, A. D., & Ord, J. K. (1973). Spatial autocorrelation. Pion. google scholar
23. Cliff, A. D., & Ord, J. K. (1981). Spatial processes: Models & applications. Pion. google scholar
24. Cournot, A. (1838). Recherches sur les principes mathématiques de la théorie des richesses. L. Hachette. google scholar
25. Dağlı, İ., & Ezanoğlu, Z. (2021). Ar-Ge, patent ve ileri teknoloji ihracatının ekonomik büyümeye etkileri: OECD ülkeleri için dinamik panel veri analizi. İnsan ve Toplum Bilimleri Araştırmaları Dergisi, 10(1), 438-460. [https://doi.org/10.15869/itobiad.780229](https://doi.org/10.15869/itobiad.780229) google scholar
26. Dereli, D. D. (2019). The relationship between high-technology exports, patent and economic growth in Turkey (1990-2015). Journal of Business Economics and Finance, 8(3), 173-180. [https://doi.org/10.17261/Pressacademia.2019.1124](https://doi.org/10.17261/Pressacademia.2019.1124) google scholar
27. Devarhubli, G. (2022). Patents, Trademarks, and Copyrights: Protecting Creative Assets. Inkbound Publishers. google scholar
28. Dinopoulos, E., & Segerstrom, P. (2010). Intellectual property rights, multinational firms and economic growth. Journal of Development Economics, 92(1), 13-27. [https://doi.org/10.1016/j.jdeveco.2009.01.007](https://doi.org/10.1016/j.jdeveco.2009.01.007) google scholar
29. Duman, E. (2017). Türkiye’de reel GSYH, AR-GE harcamaları ve ekonomik çıktılar arasındaki ilişkinin incelenmesi. International Journal of Academic Value Studies, 3(14), 12-21. [http://dx.doi.org/10.23929/javs.525](http://dx.doi.org/10.23929/javs.525) google scholar
30. Durmuşkaya, S., & Ersoy, A. Y. (2016). Effect of the rights of intellectual property on the export revenues. Fikri mülkiyet haklarının ihracat gelirleri üzerindeki etkisi. Journal of Human Sciences, 13(1), 798-808. google scholar
31. Encaoua, D., Guellec, D., & Martínez, C. (2006). Patent systems for encouraging innovation: Lessons from economic analysis. Research Policy, 35(9), 1423-1438. [https://doi.org/10.1016/j.respol.2006.07.004](https://doi.org/10.1016/j.respol.2006.07.004) google scholar
32. Ezenwakwelu, G. C., Chizoba, O. O., & Chukwuma, E. (2024). Innovation and economic growth in Nigeria (2013-2022). Madonna Journal of Administration and Management Sciences (MJAMS), 1(1&2), 1-19. google scholar
33. Griliches, Z. (1979). Issues in assessing the contribution of research and development to productivity growth. The Bell Journal of Economics, 10(1), 92-116. [https://doi.org/10.2307/3003321](https://doi.org/10.2307/3003321) google scholar
34. Gu, J. (2023). Commercialization of academic patents in Chinese universities: Antecedents and spatial spillovers. Heliyon, 9(3). [https://doi.org/10.1016/j.heliyon.2023.e14601](https://doi.org/10.1016/j.heliyon.2023.e14601) google scholar
35. Gülmez, A., & Akpolat, A. G. (2014). AR-GE, inovasyon ve ekonomik büyüme: Türkiye ve AB örneği için dinamik panel veri analizi. Abant İzzet Baysal Üniversitesi Sosyal Bilimler Enstitüsü Dergisi. google scholar
36. Hasdoğan, G. (2009). The institutionalization of the industrial design profession in Turkey: Case study—the Industrial Designers Society of Turkey. The Design Journal, 12(3), 297-319. [https://doi.org/10.2752/146069209X12530928086360](https://doi.org/10.2752/146069209X12530928086360) google scholar
37. Hausman, J. A. (1978). Specification tests in econometrics. Econometrica: Journal of the econometric society, 1251-1271. [https://doi.org/10.2307/1913827](https://doi.org/10.2307/1913827) google scholar
38. Heikkilä, J. (2019). IPR gender gaps: A first look at utility model, design right, and trademark filings. Scientometrics, 120(2), 789-814. [https://doi.org/10.1007/s11192-018-2979-0](https://doi.org/10.1007/s11192-018-2979-0) google scholar
39. Industrial Property Law No. 6769. (2017). Official Gazette of the Republic of Türkiye, No. 29944. Retrieved from [https://www.resmigazete.gov.tr/eskiler/2017/01/20170110-9.htm](https://www.resmigazete.gov.tr/eskiler/2017/01/20170110-9.htm) google scholar
40. Işık, C. (2014). Patent harcamaları ve iktisadi büyüme arasındaki ilişki: Türkiye örneği. Sosyoekonomi, 21(21). [https://doi.org/10.17233/se.58047](https://doi.org/10.17233/se.58047) google scholar
41. Ivus, O. (2010). Do stronger patent rights raise high-tech exports to the developing world?. Journal of International Economics, 81(1), 38-47. [https://doi.org/10.1016/j.jinteco.2009.12.002](https://doi.org/10.1016/j.jinteco.2009.12.002) google scholar
42. Jaffe, A. B. (1986). Technological opportunity and spillovers of R\&D: Evidence from firms’ patents, profits and market value. American Economic Review, 76(5), 984-1001. [https://doi.org/10.3386/w1815](https://doi.org/10.3386/w1815) google scholar
43. Jalil, A., & Rauf, A. (2021). Revisiting the link between trade openness and economic growth using panel methods. The Journal of International Trade & Economic Development, 30(8), 1168-1187. [https://doi.org/10.1080/00343409850117807](https://doi.org/10.1080/00343409850117807) google scholar
44. Jones, C. I. (1995). R\&D-based models of economic growth. Journal of Political Economy, 103(4), 759-784. google scholar
45. Khan, I., Zhong, R., Khan, H., & Nuţă, F. M. (2024). The effect of technological innovation, trademark application, economic growth, and CO2 emissions on renewable energy consumption in Asian Belt and Road initiative countries. Environment, Development and Sustainability, 1-22. [https://doi.org/10.1007/s10668-024-04887-w](https://doi.org/10.1007/s10668-024-04887-w) google scholar
46. Kim, Y. K., Lee, K., Park, W. G., & Choo, K. (2012). Appropriate intellectual property protection and economic growth in countries at different levels of development. Research policy, 41(2), 358-375. [https://doi.org/10.1016/j.respol.2011.09.003](https://doi.org/10.1016/j.respol.2011.09.003) google scholar
47. Köse, Z., & Şentürk, M. (2017). AR-GE Patent Harcamaları ve Teknolojik İlerlemenin Ekonomik Büyüme Üzerindeki Etkisi: Ampirik Bir Uygulama. Akademik Araştırmalar Ve Çalışmalar Dergisi (Akad), 9(17), 215-221. google scholar
48. Kwan, Y. K., & Lai, E. L. C. (2003). Intellectual property rights protection and endogenous economic growth. Journal of Economic Dynamics and Control, 27(5), 853-873. [https://doi.org/10.1016/S0165-1889(02)00018-0](https://doi.org/10.1016/S0165-1889\(02\)00018-0) google scholar
49. Lee, L. F., & Yu, J. (2010). A spatial dynamic panel data model with both time and individual fixed effects. Econometric Theory, 26(2), 564–597. [https://doi.org/10.1017/S0266466609100099](https://doi.org/10.1017/S0266466609100099) google scholar
50. Lee, L. F., & Yu, J. (2010a). Estimation of spatial autoregressive panel data models with fixed effects. Journal of Econometrics, 154(2), 165-185. [https://doi.org/10.1016/j.jeconom.2009.08.001](https://doi.org/10.1016/j.jeconom.2009.08.001) google scholar
51. Lee, L. F., & Yu, J. (2010b). A spatial dynamic panel data model with both time and individual fixed effects. Econometric Theory, 564-597. [https://doi.org/10.1017/S0266466609100099](https://doi.org/10.1017/S0266466609100099) google scholar
52. LeSage, J. P. (2014). Spatial econometric panel data model specification: A Bayesian approach. Spatial Statistics, 9, 122–145. [https://doi.org/10.1016/j.spasta.2014.02.002](https://doi.org/10.1016/j.spasta.2014.02.002) google scholar
53. LeSage, J. P., & Pace, R. K. (2009). Introduction to spatial econometrics. CRC Press. google scholar
54. Maneejuk, P., & Yamaka, W. (2021). The impact of higher education on economic growth in ASEAN-5 countries. Sustainability, 13(2), 520. [https://doi.org/10.3390/su13020520](https://doi.org/10.3390/su13020520) google scholar
55. Marshall, A. (1890). Principles of economics. Macmillan. google scholar
56. Maskus, K. E. (2019). Economic development and intellectual property rights: Key analytical results from economics. Elgar Online. [https://doi.org/10.4337/9781789903997.00033](https://doi.org/10.4337/9781789903997.00033) google scholar
57. Monseau, S. (2011). The challenge of protecting industrial design in a global economy. Tex. Intell. Prop. LJ, 20, 495. google scholar
58. Moser, P. (2013). Patents and innovation: Evidence from economic history. Journal of Economic Perspectives, 27(1), 23-44. [https://doi.org/10.1257/jep.27.1.23](https://doi.org/10.1257/jep.27.1.23) google scholar
59. Motta, M. (2004). Competition policy: Theory and practice. Cambridge University Press. google scholar
60. Nedić, V., Turanjanin, D., & Cvetanović, S. (2020). Empirical investigation of the impact of tertiary education on the economic growth of the European Union countries. Economic Analysis, 53(1), 163-178. google scholar
61. Nguyen, M.-L. T., & Bui, T. N. (2021). Trade openness and economic growth: a study on asean-6. Economies, 9(3), 113. [https://doi.org/10.3390/economies9030113](https://doi.org/10.3390/economies9030113) google scholar
62. Onuklu, A., Darendeli, I., & Mudambi, R. (2021). Regulative distance, international connectivity and innovation systems: Turkey’s links to the EU. Competitiveness Review: An International Business Journal, 31(2), 231-249. [https://doi.org/10.1108/CR-04-2020-0051](https://doi.org/10.1108/CR-04-2020-0051) google scholar
63. Ökten, N. Z., Okan, E. Y., Arslan, Ü., & Güngör, M. Ö. (2019). The effect of brand value on economic growth: A multinational analysis. European research on management and business economics, 25(1), 1-7. [https://doi.org/10.1016/j.iedeen.2018.11.002](https://doi.org/10.1016/j.iedeen.2018.11.002) google scholar
64. Özcan, S. E., & Özer, P. (2017). AR-GE harcamaları ve patent başvuru sayısının ekonomik bü yü me üzerindeki etkileri: OECD ülkeleri üzerine bir uygulama. Anadolu Üniversitesi Sosyal Bilimler Dergisi, 18(1), 15-28. [https://doi.org/10.18037/ausbd.550617](https://doi.org/10.18037/ausbd.550617) google scholar
65. Park, W. G., & Lippoldt, D. C. (2008). Technology transfer and the economic implications of the strengthening of intellectual property rights in developing countries. OECD Trade Policy Papers, No. 62. google scholar
66. Preoteasa, I., Giugea, N., & Maracineanu, C. (2017). International brand protection. Annals of the University of Craiova-Agriculture, Montanology, Cadastre Series, 47(1), 219-226. google scholar
67. Prud’homme, D. (2017). Utility model patent regime “strength” and technological development: Experiences of China and other East Asian latecomers. China Economic Review, 46, 45-60. [https://doi.org/10.1016/j.chieco.2016.11.007](https://doi.org/10.1016/j.chieco.2016.11.007) google scholar
68. Qayyum, M., Yu, Y., Tu, T., Nizamani, M. M., Ahmad, A., & Ali, M. (2022). Relationship between economic liberalization and intellectual property protection with regional innovation in China. A case study of Chinese provinces. Plos one, 17(1). [http://doi.org/10.1371/journal.pone.0259170](http://doi.org/10.1371/journal.pone.0259170) google scholar
69. Raghutla, C. (2020). The effect of trade openness on economic growth: Some empirical evidence from emerging market economies. Journal of Public Affairs, 20(3). [https://doi.org/10.1002/pa.2081](https://doi.org/10.1002/pa.2081) google scholar
70. Rahman, M. M., Saidi, K., & Mbarek, M. B. (2020). Economic growth in South Asia: the role of CO2 emissions, population density and trade openness. Heliyon, 6(5). google scholar
71. Ramos, V. J. R., & Daway-Ducanes, S. L. S. (2024). Nonlinearities in the intellectual property-manufacturing growth nexus in the post-TRIPS era: Evidence from a dynamic panel analysis. Journal of the Knowledge Economy. [https://doi.org/10.1007/s13132-024-02235-x](https://doi.org/10.1007/s13132-024-02235-x) google scholar
72. Republic of Türkiye Ministry of National Defence (2024, November 15). Province and district area measurements. Directorate General for Mapping. [https://www.harita.gov.tr/il-ve-ilce-yuzolcumleri](https://www.harita.gov.tr/il-ve-ilce-yuzolcumleri) google scholar
73. Robinson, J. (1933). The economics of imperfect competition. Macmillan. google scholar
74. Romer, P. M. (1986). Increasing returns and long-run growth. Journal of Political Economy, 94(5), 1002-1037. [https://doi.org/10.1086/261420](https://doi.org/10.1086/261420) google scholar
75. Romer, P. M. (1990). Endogenous technological change. Journal of Political Economy, 98(5, Part 2), 71-102. [https://doi.org/10.1086/261725](https://doi.org/10.1086/261725) google scholar
76. Schartinger, D. (2023). Why firms do (not) use design rights to protect innovation: A literature review. World Patent Information, 73, 102175. [https://doi.org/10.1016/j.wpi.2023.102175](https://doi.org/10.1016/j.wpi.2023.102175) google scholar
77. Schautschick, P., & Greenhalgh, C. (2016). Empirical studies of trade marks: The existing economic literature. Economics of Innovation and New Technology, 25(4), 353-380. [https://doi.org/10.1080/10438599.2015.1064598](https://doi.org/10.1080/10438599.2015.1064598) google scholar
78. Schumpeter, J. A. (1934). The theory of economic development. Harvard University Press. google scholar
79. Schumpeter, J. A. (1942). Capitalism, socialism, and democracy. Harper & Brothers. google scholar
80. Shaikh, S. M., Patnaik, D., & Fernandes, M. J. (2024). Intellectual Property Rights (IPR) and Its Effect on the Flow of Cross-Border Mergers and Acquisitions (M\&As). [https://doi.org/10.37394/23207.2024.21.106](https://doi.org/10.37394/23207.2024.21.106) google scholar
81. Soejoto, A., Ghofur, M. A., & Rachmawati, L. (2022). The effect of population density, educational access ınequality and health access ınequality on economic growth. AL-ISHLAH: Jurnal Pendidikan, 14(3), 4011-4022. [https://doi.org/10.35445/alishlah.v14i3.1674](https://doi.org/10.35445/alishlah.v14i3.1674) google scholar
82. Solow, R. M. (1956). A contribution to the theory of economic growth. Quarterly Journal of Economics, 70(1), 65-94. [https://doi.org/10.2307/1884513](https://doi.org/10.2307/1884513) google scholar
83. Stigler, G. J. (1964). A theory of oligopoly. Journal of Political Economy, 72(1), 44-61. [https://doi.org/10.1086/258853](https://doi.org/10.1086/258853) google scholar
84. Suluk, C. (2012). A comparative law perspective of industrial designs in Turkey. IIC-International Review of Intellectual Property and Competition Law. google scholar
85. Sungur, O., Aydın, H. İ., & Eren, M. V. (2016). The relationship among R\&D, innovation, export and economic growth in Turkey: Asymmetric causality analyis. Suleyman Demirel University The Journal of Faculty of Economics and Administrative Sciences, 21(1), 173-192. google scholar
86. Suthersanen, U. (2006). Utility models and innovation in developing countries. IPR Online Report. google scholar
87. Şaşmaz, A. B. (2024a). Tü rkiye’nin yatay ve dikey endü stri içi ticaretinin teknoloji sınıflandırması çerçevesinde analizi. Ömer Halisdemir Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi, 17(2), 272-304. [https://doi.org/10.25287/ohuiibf.1403052](https://doi.org/10.25287/ohuiibf.1403052) google scholar
88. Şaşmaz, A. B. (2024b). Türkiye-OECD ülkeleri arasındaki imalat sanayisi yatay ve dikey endüstri içi ticaretinin belirleyicileri. Marmara Üniversitesi İktisadi ve İdari Bilimler Dergisi, 46(2), 492-517. [https://doi.org/10.14780/muiibd.1403080](https://doi.org/10.14780/muiibd.1403080) google scholar
89. Şaşmaz, A. B. (2025) Regional income inequality and trade openness in Türkiye: A spatial econometric analysis. Afyon Kocatepe Üniversitesi İktisadi ve İdari Bilimler Fakültesi Dergisi, 27(Özel Sayı), 20-34. google scholar
90. Tang, T. C., & Lai, S. L. (2022). Government spending on tertiary education, knowledge, technology, and economic growth. Journal of Economic Development, 47(4), 99-122. google scholar
91. Tirole, J. (1988). The theory of industrial organization. MIT Press. google scholar
92. Turkish Patent Institute (2024, November 15). Official Statistics. [https://www.turkpatent.gov.tr/istatistikler](https://www.turkpatent.gov.tr/istatistikler) google scholar
93. Turkstat (2024, November 15). Data portal for statistics. [https://data.tuik.gov.tr/](https://data.tuik.gov.tr/) google scholar
94. Ulaşan, B. (2012). Openness to international trade and economic growth: a cross-country empirical investigation (No. 2012-25). Economics Discussion Papers. [https://hdl.handle.net/10419/58224](https://hdl.handle.net/10419/58224) google scholar
95. Yanikkaya, H. (2003). Trade openness and economic growth: a cross-country empirical investigation. Journal of Development economics, 72(1), 57-89. [https://doi.org/10.1016/S0304-3878(03)00068-3](https://doi.org/10.1016/S0304-3878\(03\)00068-3) google scholar
96. Yıldız, G. (2018). Teknolojik inovasyonun ekonomik büyüme üzerindeki etkisi: Türkiye-AB (15) ülkeleri örneği. Uluslararası İktisadi ve İdari İncelemeler Dergisi, 41-58. google scholar
97. Yoshioka-Kobayashi, T., Fujimoto, T., & Akiike, A. (2018). The validity of industrial design registrations and design patents as a measurement of "good" product design: A comparative empirical analysis. World Patent Information, 54, 1-12. [https://doi.org/10.1016/j.wpi.2018.04.001](https://doi.org/10.1016/j.wpi.2018.04.001) google scholar
98. Yu, C., & Shen, B. (2024). Intellectual property policy and county economic growth: A quasi‐natural experiment from the intellectual property powering county project. China & World Economy, 32(6), 35-67. [https://doi.org/10.1111/cwe.12557](https://doi.org/10.1111/cwe.12557) google scholar
99. Yu, J., De Jong, R., & Lee, L. F. (2008). Quasi-maximum likelihood estimators for spatial dynamic panel data with fixed effects when both n and T are large. Journal of Econometrics, 146(1), 118-134. [https://doi.org/10.1016/j.jeconom.2008.08.002](https://doi.org/10.1016/j.jeconom.2008.08.002) google scholar