Why didn't Labor agree to a rent freeze?

The government says its key policy on affordable and social housing will pass the senate this week – after securing the support of the Greens yesterday.

The Greens had hoped to force the government to impose a cap on rents, but after months of tense debate, the bill will pass without a rent freeze.

So how did rent caps become such a sticking point? Are they even possible in Australia? And do they actually work?

Today, honorary research fellow in urban geography and planning, and contributor to The Saturday Paper, Dr Kate Shaw, on why rent controls are so controversial. 

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Guest: Honorary Research Fellow in Urban Geography and Planning Dr Kate Shaw