Organised crime, cash jobs, and underreported income are making up New Zealand's black market

Recent World Bank estimates suggest New Zealand's informal economy is around 11 percent of our official GDP, or around 50 billion dollars.

Geof Nightingale says without Stats NZ or the IRD measuring it, it's hard to know exactly the size of New Zealand's informal economy.

He says there is definitely a black economy, but he doubts it would be quite as big as the World Bank is predicting.