The Warehouse merger

So the commerce commision has released documentation on their refusal to let Foodstuffs or Progressive buy the Warehouse. They believe that the merger would not influence the general merchandise or wholesale foods market, but would negatively influence supermarket competition.

Do you think that a merger would negatively impact supermarket competition, and if so how?

It is important to note that one of the significant factors behind the increase in the value of retail sales in the past few months has been rising supermarket prices. But is this the result of a lack of competition, or a result of the success of the Warehouse grocery chain (given that the Warehouse sells their grocery products at a higher price).