I am sure there will be lots of squabbling over parameters and assumptions of any tax, spending or regulation proposal submitted to the independent costings unit proposed recently by the New Zealand Greens.
The bigger problem is static and dynamic scoring. There is some history of doing this for taxes but little for spending and that is before you consider externalities. Imagine the squabbling over roading proposals and their externalities. The practical hurdles to dynamic scoring are:
- Economists do not know how to accurately measure the growth effects of most policies
- Dynamic scoring relies on less-than-accurate, theory-based macro models
- The macro models undergirding dynamic scoring have numerous controversial and unproven built-in assumptions
- The assumptions embedded in the macro models are not always carefully empirically based
- Macro models…
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Utopia, you are standing in it! 
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