Scott3:
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What the government can afford is just a function of how much they are willing to borrow (or to change tax take / spending in other area's). So if there was the political will they could absolutely keep the 25c discount for an extended period.
I don't buy your reasoning regarding am extended 10c tax reduction, based on GST take for the following reasons (no sources to just cite, just my take):
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All fair points.
Mine was a straight mathematical comparison.