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A financial investigation by a private firm finds that a new railway line would not be profitable. 
A cost-benefit analysis finds that the line is worth constructing. 
What could explain this difference?

1 ) 

There are external costs not included in the financial investigation. 

2 ) 

There are external benefits not included in the financial investigation.

3 ) 

A higher rate of interest is used in cost-benefit analysis.

4 ) 

Cost-benefit analysis uses a higher estimate for wage costs.

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