Talks between 12 nations to agree the Trans Pacific Partnership trade deal may have failed last week, but New Zealand's Prime Minister John Key has told the BBC that he is confident the pact will be signed by the end of the year.

New Zealand was one of the original nations involved in the TPP, which if a deal is concluded will create a "mega regional" bloc with a combined GDP of $28 trillion.

Mr Key explains why he was optimistic that an agreement will be reached.

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