Here is a way that John Key can save taxpayer’s money. I wonder if there is any similar study in New Zealand? I doubt it-

The (Integration Ministry) report—initiated by the right-wing populist Danish People’s Party (DPP)—came to the conclusion that by tightening immigration laws, Denmark has saved €6.7 billion ($10 billion) over the last 10 years, money which otherwise would supposedly have been spent on social benefits or housing. According to the figures, migrants from non-Western countries who did manage to come to Denmark have cost the state €2.3 billion, while those from the West have actually contributed €295 million to government coffers.

Source.