The authors find that a group of 22 institutions, which received most of the funds, form a strongly connected graph where each of the nodes becomes systemically important at the peak of the crisis. The default of each one would have a larger economic impact on the whole network. Even small, dispersed shocks to individual banks could thus have triggered the default of a large portion of the system. The authors note that because the network of impact used in the study is a proxy of the real, unknown network, the findings should be regarded with caution, but the study shows the kinds of insights that can be gained using DebtRank.
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