The Government is looking to crack down on merger rules.

The Ministry of Business, Innovation and Employment is reviewing the Commerce Act - which could lead to blocking more proposed mergers and acquisitions. 

It's also hoping to give the Commerce Commission more teeth.

Commerce and Consumer Affairs Minister Andrew Bayley says they're making sure the laws are fit for purpose.

"We've got a number of industries where we've got a small number of players who've got very significant market shares - and it means less innovation happening and more New Zealanders paying more than they ought to."

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