A claim has come that the current reforms to our supermarket sector won't bring proper competition.

Statistics New Zealand data shows that as food costs jumped 12.5 percent in the year to April, fruit and vegetables shot up 22 percent.

Westpac Industry Economist Paul Clark says methods like splitting up the duopoly would have a much more dramatic effect.

He says alongside increased food prices for New Zealanders,  there's another downside caused by the duopoly.

Clark says it means a lack of choice for consumers.

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