The nation's pension programme, into which almost all citizens pay, is supported by the world's largest investment fund, worth a staggering USD 1.26 trillion equivalent to one-quarter of the country's entire economy.
It towers over its nearest competitor, the USD 700 billion belonging to Norway -- and is multiples of the USD 173 billion holdings of Temasek, the Singaporean sovereign wealth fund.
But, unlike some other more adventurous vehicles, the Government Pension Investment Fund (GPIF) keeps by far the majority of its cash in super-safe -- and super low return -- Japanese government bonds.
The bid to shake up Japan's slumbering economy after two decades of drift began in early 2013 with a huge public spending bonanza and unprecedented monetary easing from the Bank of Japan.
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But, 18 months down the line, the initial sugar rush is fading, and Abe must now put in place some of the structural reforms he -- and most economists -- say are necessary.
Not least of which is getting more bang for the buck on the public pension fund to help a shrinking number of workers pay for a growing number of retirees.
Earlier this month, Abe reportedly instructed his welfare minister to review the fund's operating portfolio, urging it to make more aggressive investments in foreign and domestic stock markets.