Abstract
This work discusses the risk contagion in the stock market from perspective of econophysics. Through the agent-based analysis, agents in stock market are supposed to have four types: susceptible agents, infected agents, contagious agents and immune agents. As different types of agents are set to have different contagious probabilities, grapevine news is likely to be transmitted among different agents. The results show that, according to the conditions imposed, the experiment stops at time 292. At the point, the most agents are immune agents and only the few are susceptible agents and contagious agents. In addition, infected agents are non-existence at the end of experiment. In the respect of curve characters, the curve of susceptible agents shows a gradually increasing trend, and the curve of immune agents presents a gradually decreasing trend. In particular, the curves of infected agents and contagious agents are a similar feature, which is an increasing trend at first and then a decreasing trend.
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