Research on risk contagion mechanism of big fintech based on the SIRS model.

After reaching the peak, the density of infected big fintech companies does not show a decreasing trend, indicating that the risk is still spreading in the connected network at this time. 3.2 Impact of infection rate change on risk transmission process Other parameter values remain unchanged when the risk transmission rate α is 0.8,0.6,0.4 and 0.2 respectively, the density changes of big fintech companies in the infected state and immune state are shown in Fig 4 .

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As can be seen from Fig 3 , the density of big fintech companies in the infected state shows an increasing trend over time.

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