An economist warns fixing the supermarket sector is much more complicated than breaking up the big players.
The Institute of Economic Research says the move could increase competition but will also be expensive and inefficient for purchasing and distribution.
It wants barriers addressed like limited wholesale access, purchasing advantages for current players, and trouble securing retail sites.
Institute senior economist Susie McKenzie told Mike Hosking limited wholesale access is an unresolved barrier.
She says we need to understand why existing reforms haven't made a difference and aren't giving better access.
McKenzie told Hosking all our political parties are just suggesting different solutions to different problems.
She says from the supermarket challenge is very complicated and there's no simple solution.
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