What happens if we slash migration?

The opposition leader Peter Dutton has set migration up to be a key issue as we head to an election within a year. He says he’ll slash numbers to help address overwhelming demand for housing, childcare and hospital beds. But what would life be like if immigration slowed dramatically?  Today, economist Saul Eslake on population growth and whether we really need it.  Featured:  Saul Eslake, independent economist