Finance Minister Bill English presented an easy target this week when he acknowledged that estimates of how much the Government would make from partial sales of state-owned enterprises were "a guess".
The Government has repeatedly said the sales would yield between $5 billion and $7 billion. Those were the numbers that featured in last year's Budget and the pre-election fiscal update. But this week, after the decision was confirmed by Cabinet, Treasury had to pick a number.
The $6 billion that it settled on - the middle of the previous range - was suspiciously imprecise and English moved quickly to clear himself some wiggle room. "It is not our best guess," he said. "It's just a guess ... That's an honest answer."
It seemed odd. If the Minister was suggesting that a better guess were possible, why did he not ask the highly paid boffins across Bowen St to produce it? In all likelihood, they did, of course, but English wasn't prepared to have any number carved in stone. His vagueness was canny, but it would have been more honest to say nobody has much of an idea.
He did say "If there is an economic meltdown in Europe, then we would need to rethink," which meant much the same thing. The global economic turmoil makes asset sales an unpredictable business. Making matters worse is that the National-led administration has to at least consider tailoring (read watering down) the relevant legislation to take account of intense opposition both from the public at large and the Maori Party, whose confidence and supply agreement provides the Government with a secure majority.