The latest annual grocery report noted Foodstuffs, in particular, was strongly profitable.
There has been scant improvement in supermarket competition over the past year, and now more needs to be done, commentators say.
The Commerce Commission has released its latest annual grocery report, which says there has been little observable change in core competition metrics.
The major grocery retailers - Foodstuffs and Woolworths - have 82 percent of the market, just 2 percent down from 2020.
Auckland is the most competitive market in the country, with 71 percent of the market held by the duopoly. The top and west coast of the South Island were the least competitive, at 92 percent.
