THE YEN TRAP

The world's oldest carry trade is unwinding - and America may not be there to catch it.

For thirty years, Japan has run the boldest monetary experiment in modern economic history: interest rates pinned near zero while the rest of the world moved on. That gap turned the yen into the most heavily used funding currency on earth - a trade so large that Morgan Stanley estimates more than $500 billion in leveraged positions remain outstanding today.

Now the Bank of Japan is normalizing. The yen is trading near a 40-year low. Tokyo spent $71.7 billion in a single month defending its currency - and the market barely blinked. And for the first time since the Federal Reserve's dollar swap lines became standing policy in 2013, foreign central bankers are openly asking a question that used to be unthinkable: will the next Fed still be willing to backstop the system when it matters most?

In The Yen Trap, Robert F. Geissler traces the yen carry trade from Japan's 1990s deflation crisis through the August 2024 unwind that rattled global markets, to the fragile bargain holding up the world's financial architecture today. Drawing on an Austrian and Chicago School economic framework, Geissler lays out exactly how the trade works, why the American backstop exists, what happens if it doesn't hold - and the four realistic paths Japan and the United States have left to defuse it before the market chooses for them.

This is not a book about Japan alone. It's a stress test for every heavily indebted, fiat-currency economy watching from the sidelines - including our own.