Such a policy had been previously criticised by Finance Minister Grant Robertson as recently as May, when he claimed it would be too difficult to administer and supermarkets would likely benefit more than consumers.
National understands Robertson has been overruled by Chris Hipkins, with the Prime Minister set to announce the policy as part of its tax plans.
Hipkins so far won’t confirm or deny any of the claims.
Dickason is on trial at the High Court in Christchurch accused of murdering her three young daughters in Timaru.
A psychiatric expert, who focuses on why parents kill children, has given extensive evidence in support of Dickason’s defence of insanity and infanticide.
Doctor Susan Hatters-Friedman interviewed Dickason for 10 hours - over four days - revealing she had frequent thoughts about killing the girls.
SEARCH FOR YANFEI BAO
Police are taking to the sky in the search for missing Christchurch real estate agent Yanfei Bao.
She was last seen more than a week ago and a 52-year-old man has since been arrested and charged with kidnapping
The police homicide investigation is focusing on the Halswell River, where the national dive squad has been using sonar tech.
Grid searches are underway in New Brighton and Lake Terrace Roads - as well as the Greenpark suburb.
Today, a helicopter will assist efforts over Lake Ellesmere.