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The difficulty I have with the above analogy is that it would be comparing something that is known (1910 to today) to something that is unknown. in that sence at least, there's an element of trust me and hence risk.As for CBA, let me repeat (once more) the argument why it's utterly worthless:
The NBN is an enabling technology. It is impossible to value the benefits of building it, because we don't know what most of the benefits will be. One could only guess about developments for the next 5 or 10 years, let alone the next 50 years. Any CBA would therefore be completely inaccurate.
To illustrate my point, I suggest you do a CBA for the copper telephone network rollout, valuing only the uses/benefits that were known in (say) 1910.
Let me know if the per-capita cost (which is about the same as the NBN, adjusted) would be worth it, considering the only use would be basic person-person voice communications.
If you don't think that's a valid argument/analogy, please explain why not.
The best decisions are generally those that are weighed against tangable pros and cons. Beyond that, it's luck. It may be difficult to do a cost benefit analysis, but that doesn't justify not doing it.
If the project is completed, the government may well pay off the associated borrowings but then it is setting it up as a monolopy.