On budget day, the standard remedy to any problem is to throw money at it. So it was good to see the supply side of the housing market get some attention in the budget today.  The vacant site levy is being replaced by a zoned land tax. This new tax is on residential zoned land which is serviced (ie connected to power and water), but has not been developed yet.  The zoned land tax is an extension of the existing vacant site levy. The vacant site levy is a 7 per cent annual tax on lands suitable for housing but…