A leading free market thinktank claims Ed Miliband's pledge to cap rent rises in the private sector "defy economic logic" and will end up harming the poor.
Mark Littlewood, director general of the Institute of Economic Affairs, said the proposal to make tenancies three years long might "lead to landlords being uncooperative in the hope that tenants leave early".
He claimed the "key factor" in high rents was a shortage of housing and called on politicians to reform "draconian planning laws" to boost supply.
More top news
Nigel Farage told Peston on Sunday he will not be backing Suzanne Evans as the next Ukip leader.
Transport secretary Chris Grayling said MPs will decide this week about where to allow airport expansion in south east England
An investigation has been launched after nine people were hurt when stairs collapsed in a House of Horrors at a theme park in Ireland.