The Finance Minister is defending the Government's scheme to take GST off fresh and frozen fruit and vegetables.

It's faced criticism from economists and opposition politicians, including a mistake on when the policy would come in- throwing the cost out by $235 million.

There's also questions about exactly what will be left and left out under the system.

Grant Robertson says that shouldn't be a barrier.

"These kinds of decisions about what's in and out in a regime get made all over the world."

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