The Commerce Commission's statement outlines the main issues it considers important in deciding whether or not to grant clearance to the proposed merger.
The commission will investigate whether the proposed merger is likely to substantially lessen competition in the relevant markets by looking mainly at the" unilateral effects" that might result from the merger.
"In particular, we will consider whether the merged entity would be able to raise prices above the prevailing level", the statement said.
"We will also look at whether the proposed merger is likely to result in co-ordinated
effects. That is, whether the merged entity would be able to co-ordinate with rivals to
raise prices."
The commission has called for submissions on the merger and is expected to make a decision on the application by February 15, 2018.
The Watties operation in Hastings was the first to be established by James Wattie in 1934. There are now two manufacturing facilities in the area.
The King St site is the original home of Watties' operations and now employs more than 500 permanent employees and up to 800 seasonal workers.