对于一种占有50%市场交易量的方法，其本身也会给市场带来系统性风险。
A group that accounts for nearly 50% of a market also introduces systemic risk.
所谓系统性风险，是指由某个个体或部分的损失而带来大多数个体乃至整体的损失的风险。
Systemic risk refers to the risk or probability of breakdown(losses) in individual parts of components and is evidenced by co-movements(correlation) among most or all parts.
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