There are two dominant supermarket chains in New Zealand: Australian-owned Woolworths NZ and Foodstuffs. Woolworths is the owner of Countdown while Foodstuffs owns New World, Pak'nSave and the smaller Four Square.
Clark said some of the big supermarket operators have said there is already a healthy degree of competition in the sector but "we want to test whether that is the case".
Being checked out is the structure of the grocery industry at the wholesale and retail levels; the nature of competition at the wholesale and retail levels of the grocery industry; the pricing practices of the major grocery retailers; as well as the price, quality, product range and service offerings for retail customers.
As well as the experience of the consumer, the study will look at the way supermarkets procure goods - and this could be good news for growers and producers who have long grumbled about supermarkets setting prices at poorly, take-it-or-leave-it levels. Some transparency might finally unearth the truth.
Clark's stated objective of using the study to help "regulate" the sector won't have been missed by the big supermarket chains. Let's hope shoppers are in receipt of some good news at the checkout as a result.