Labour says it will tackle the supermarket duopoly in its first 100 days, if it forms the next government.
The party will force Foodstuffs and Woolworths to break their wholesale and retail arms up into separate businesses.
It says it will also crack down on big companies ripping people off - by making price gouging illegal.
Commerce and Consumer Affairs Spokesperson Arena Williams told Ryan Bridge the idea for a wholesale-retail split comes from the Commerce Commission's work.
She says National could have done this in 2025 - when Woolworths brought a credible plan to transition the industry to separate wholesalers.

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