"Northland is growing, the population is growing which means there are more consumers. Unemployment figures are getting better so people have more money to spend.
"The increases in retail spending over the years has been more than just incremental. We've had a strong economy the last three years and consumer confidence is strong."
Mr Collins said since Northlanders believed their businesses were in a good environment, they were investing in their employees as well.
During summer, he said an influx of tourists boosted sales not just in major centres but also in rural towns.
A number of new small to medium businesses have started in Northland which was very encouraging, he said.
"The whole strategy that Northland has adopted of Twin Coast Discovery where people visit areas like the Hokianga and if we can get people to not only spend their money but to stay longer in Northland," Mr Collins said.
In the September quarter last year, the retail spending in Northland was $633m, in June $667m, and in March $695m.