On Monday, August 3, Japan’s finance minister confirmed what traders had suspected all weekend: Tokyo and Washington jointly bought yen on Friday, the first coordinated US-Japan currency intervention since 2011. The yen had just touched its weakest level since 1986. What made this round different wasn’t the buying — it was how Japan is funding it. Instead of selling US Treasuries, Japan flagged plans to tap the Federal Reserve’s FIMA repo facility.
A repo, short for repurchase agreement, is a way to borrow cash without giving up an asset. You hand over a bond as collateral, receive dollars today, and agree to buy the bond back later at a slightly higher price — the gap between the two prices is effectively the interest. The bond never changes hands permanently. It’s parked, not sold.
This distinction matters because Japan holds more than $1 trillion in US Treasuries, and its usual way of raising dollars to buy yen has been selling those Treasuries into the open market. But selling adds supply right when the market least wants it: on Thursday, July 30, Japan had already sold close to $59 billion in a single day to defend the yen, and the 10-year Treasury yield was sitting near 4.75% — already elevated. More Treasury sales from a major holder like Japan risk pushing yields even higher, which raises US borrowing costs. A CNBC report on the intervention noted that the FIMA facility exists precisely to let central banks raise dollars “without outright sales” for this reason.
A repo sidesteps the problem entirely. Japan pledges the Treasuries instead of selling them, gets the dollars it needs, and the bond market never sees a seller show up. No visible supply, no price signal. It’s the same logic behind why Nvidia recently chose to borrow $25 billion it didn’t strictly need rather than sell assets — a loan preserves optionality that a sale gives away. It also echoes how a forward currency contract lets a company lock in an outcome without actually parting with anything today.
The broader point isn’t really about central banks. Selling an asset and borrowing against it can raise the exact same amount of cash — but they send completely different signals to a market watching for the next move.
My take: Selling shows your hand; borrowing against it doesn’t.
Not advice. Just how I see it.