So far "Abenomics", as Japanese are calling his monetary and fiscal loosening, has lowered the yen, giving exporters a boost, and ignited the sharemarket. Latest figures show a lift in growth. But he has promised much more than another burst of export-led growth. Japan and the world economy would both benefit from sustained consumption growth within the country. The removal of job protection and other internal reforms are vital. The TPP offers a means to bring those about.
The Pacific initiative is not the only regional trade agreement giving renewed hope for progress in global trade rules. The US and the European Union are discussing a Trans-Atlantic Trade and Investment Partnership. And the more liberal Latin American trading nations - Mexico, Colombia, Peru and Chile - are proposing a "Pacific Alliance".
The World Trade Organisation's Doha round may be beyond revival but WTO principles are being applied in these big regional negotiations and any agreements reached are likely to be open to all countries prepared to sign up to rules that will cover investment, intellectual property, state procurement and trade in services as well as goods.
All countries will want to safeguard certain rights. New Zealand's state medicine purchaser, Pharmac, should be sacrosanct. Japan wants to retain "sanctuaries" for its rice farmers, a traditional industry of now ageing folk on small plots. They are a powerful lobby, particularly within the Liberal Democratic Party now restored to power.
Trans-Pacific partners could respect the high cultural value Japan reserves for home-grown rice but should insist the protection of other agriculture is phased out in 10 years. Australia and New Zealand have been the most wary of Japan's inclusion in the talks. Both have long struggled for access to that market for their farm products. If this visit provides further evidence that Japan's intentions are genuine, it will be most welcome.