Before revision:  When congestion is included as well, the resulting networks are denser and resemble the bipartite expander graphs that have been proposed in the supply chain literature  .
After revision:  When congestion is included as well, the resulting networks are denser and resemble the bipartite expander graphs that have been proposed in the supply chain literature , thereby, providing the first example of endogenous formation of resilient supply chain networks, without resilience being explicitly encoded in payoffs .