Now, here’s a curious thing…

In 1999, the republic referendum cost $66 million. In real terms today, that’s $133 million.

Since 1999, Australia’s population has gone from approximately 18.8 million to 26.3 million, constituting about a 45 per cent increase.

So, then, you might reasonably expect the upcoming Voice referendum to cost 45 per cent more than $133 million; that is, $193 million.

But it doesn’t.