A government conducts a cost-benefit analysis into the construction of a new high-speed railway network. The analysis reveals the following information.
If it is to build the railway network, the government requires that the net social benefit is more than US$20 billion.
What must the external costs be to satisfy the government?
under US$40 billion
2 )
over US$40 billion but below US$60 billion
3 )
over US$60 billion but below US$160 billion
4 )
over US$160 billion
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