AUSTRALIA has a history marked by uncertainty when it comes to population size. Even the Treasury’s Intergenerational Report that caused so much recent controversy by forecasting Australia’s population will rise to 36 million by 2050 is coy on the topic. Nowhere in its 164 pages does it set out the breakdown for the increase by births and migration. You get the distinct impression the omission was deliberate. But are we, as a nation, still not up for an open discussion about the role of migration and population?