The World's Biggest Carry Trade

The BOJ can not afford to hike interest rates, because the government of Japan is engaged in a massive $20 trillion carry trade:

First, recall that the carry trade involves borrowing in one currency cheaply (Japanese yen) and converting that borrowed money into a foreign currency which offers a superior yield.

Excellent papers from the St Louis Fed, IMF, and Deutsche Bank consolidate the Japanese government’s balance sheet to include the central bank (BoJ), state-owned banks (namely, PostBank) and pension funds (namely, GPIF, the world's biggest pension fund).

On the liability side, Japan is primarily funded in low yielding Japanese Government Bonds (JGBs) and even lower-cost bank reserves. The asset side is mostly loans like the Fiscal and Investment Loan Fund (FILF), and foreign assets, primarily via Japan’s largest pension fund (the GPIF).

As the authors of the Fed paper argue, Japan is funding itself at very low real rates imposed by the BoJ on domestic depositors, while earning higher returns on foreign and domestic assets of much higher duration. As that return gap has been expanding, this has created extra spending flexibility for Japan's govt.

At a gross balance sheet value of around 505% GDP, or $20 trillion, the Japanese government's balance sheet is, simply put, one giant carry trade.

Crucially, one third of this funding is now effectively in overnight cash: if the central bank raises rates the government will have to start paying money to all the banks and the carry trade’s profitability will quickly start unwinding.

Consider what would happen if sustained inflation required the BOJ to hike rates: the liability side of the government balance sheet will take a huge hit via higher interest payments on bank reserves and a decline in the value of JGBs. The asset side will suffer via a rise in real rates and an appreciation of the yen that causes losses on net foreign assets and potentially domestic assets too.

This is key to understanding Japan in the coming years.

"Small bands of men,
in absolute determination,
giving themselves completely,
and saying "Europe shall live",
and stood firm,
and faced the menace to Europe,
and came together,
and those hordes were thrown back.
Again and again and again."
- Sir Oswald Mosley

Now is the time,
to join a small band,
to come together,
and rally against the horde.

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