A cost-benefit analysis of a proposed underground railway produced the following statistics.
What can be concluded from the statistics?

1 )
If undertaken by the private sector there would be a loss of $13m.
2 )
If undertaken by the private sector there would be a profit of $3m.
If undertaken by the public sector there would be a net social benefit of $15m.
4 )
If undertaken by the public sector there would be a net social cost of $1m.
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