In the process of financing, small and medium-sized enterprises obtain funds through mutual guarantee, joint guarantee and other forms to form a guarantee chain. On the guarantee chain, the debt default risk caused by the guaranteed enterprise failing to pay off the debt according to the agreed time will infect the guarantee enterprise and affect the operation of the guarantee chain capital. This paper takes the guaranteed enterprise as the research object, and based on the characteristics of the guarantee chain business process, defines the asset-liability ratio of the guaranteed enterprise, the degree of information disclosure, the profitability and the guarantee rate of the guaranteed enterprise's net assets and other influencing factors, and uses the hidden Markov with the characteristics of state transfer to construct the default risk contagion model of the guarantee chain debt. To measure the influence degree of debt default risk contagion of the guaranteed enterprise. It is found that the asset-liability ratio and the guarantee ratio of net assets are positively correlated with the contagion intensity of the debt default risk of the guaranteed enterprise, while the degree of information disclosure and profitability are negatively correlated with the contagion intensity of the debt default risk of the guaranteed enterprise.

Guo Mingming, Wu Hongxin. Study on contagion of debt default risk of the secured party in the guarantee chain—From the perspective of small and medium-sized enterprises. Academic Journal of Business & Management (2024) Vol. 6, Issue 3: 158-164. https://doi.org/10.25236/AJBM.2024.060320.

[1] Global Economic and Financial Research Group, Bank of China Research Institute. The Global economy is likely to fall into recession, vigilant against sliding into financial crisis and economic crisis -- Bank of China Global Economic and Financial Outlook Report (Second Quarter of 2020) [J]. International Finance, 2020(04):43-50.

[2] Ma Li, Han Sujuan, Xu Huimin. Research on SME guarantee Chain risk -- Taking Wenshui County SME Guarantee chain Risk as an example [J]. Modern Business, 2017(32):79-80.

[3] Zhang Zexu, Li Pengxiang, Guo Jue. Contagion Mechanism of Chain of Guarantee Crisis [J]. Systems Engineering, 2012,30(04):25-31.

[4] ZHANG Lecai, Yang Hongxiang. Risk contagion mechanism of enterprise capital guarantee chain [J]. Reform of Economic System, 2013(01):127-131.

[5] Tan Ben-Yan, Yuan Shen-peng. An early warning analysis of corporate debt default characteristics based on XGboost [J]. Friends of Accounting, 2023(19):74-81.

[6] Wang Ning. Path Identification of default risk generation of Listed Companies: An Empirical Analysis based on Heterogeneous Stochastic Frontier Model [J]. Contemporary Economic Research, 2019(02): 99-107.

[7] Fisman R. Facilitating Development: The Role of Business Groups [J]. World Development, 2003, 32(4).

[8] Li Mingming, Liu Haiming. Formation Mechanism of guarantee circle Phenomenon in Listed companies -- Based on the perspective of inter-firm relationship [J]. Securities Market Review, 2018(01):21-29.

[9] Aolin L, Guangyuan X, Weiguo F. Credit Risk Transfer in SME Loan Guarantee Networks [J]. Journal of Systems Science & Complexity, 2017, 30 (5) : 1084-1096.

[10] Xu Kai, Zhou Zongfang, Qian Qian. The influence of information two-way transmission and individual response on the contagion of associated credit risk [J]. Systems Engineering, 2019,38(02):11-19.

[11] Xie Xiaofeng, Zhou Zongfang. Contagion and spillover effect of associated credit risk in supply chain based on repo guarantee [J]. Management Review, 201,33(09):304-314.

[12] Chengying H, Xiaoxu G, Chunzhi T, et al. Fintech and corporate debt default risk: Influencing mechanisms and heterogeneity [J]. Journal of Business Research, 2023,164.

[13] Li Zhanlei, Li Rui, Xu Yongqiang. Research on Credit risk Contagion related to Mutual Guarantee Financing -- Based on Borrower default perspective [J]. Friends of Accounting, 2023(11):25-31.

[14] WALTERS N, VAN ZYL G, BEYERS C. Financial Contagion in Large, Inhomogeneous Stochastic Interbank Networks [J]. Advances in Complex Systems, 2019,22(2).

[15] Liu Zhiyang. Analysis of default contagion risk among Chinese banks under Network structure: A two-dimensional data perspective of inter-bank debt correlation and financial market [J]. Journal of Contemporary Economic Science, 2019,42(03):69-79.

[16] Wu Yanwen, Li Luqing, Lin Sitong. Analysis on mutual guarantee financing risk of SMEs [J]. Western Finance and Accounting, 2022(11):51-54.

[17] Yan Tao. Research on Guarantee circle risk of Listed Companies based on Complex network Method [D]. Southwest University of Finance and Economics, 2020. 

[18] Li Zhanlei, Zhang Wenyi, Li Hongmei. Research on Hidden Markov process of risk contagion of leveraged lease default: Based on Lessee default perspective [J]. Friends of Accounting, 2023(22):93-98.