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Republic Research / ARTICLE

The tape looks great this morning. Amazon's blowout has the tech trade roaring back, Korea's market ripped overnight, and all three of our momentum readings are green again. But the thing actually holding this up is shakier than the screen makes it look. Japan is the reason, and it's worth understanding. Their finance ministry stepped into the currency market yesterday. The yen had been grinding down toward levels it hasn't touched in 40 years, and they moved to prop it up, buying yen and selling dollars to do it. The dollar had its worst day in about four years off the back of that, down roughly 3%. That's the part that reaches us. A weaker dollar loosens financial conditions, and that's a real piece of why stocks took off yesterday and why they're still bid this morning. So the rally we're enjoying is, in part, a product of Japan defending its currency two days ago. The reason we don't lean on it is that the move doesn't fix anything underneath. The yen keeps falling because Japan's interest rates sit far below the rest of the world's, and that gap isn't closing. The Fed held this week and the BOJ is expected to hold too. So traders keep borrowing cheap yen and parking it in higher-paying dollars, earning something like 260 basis points a year to do nothing, and that steady pull drags the yen back down no matter how much Tokyo buys. They've already shown it doesn't last. Back in April and May, Japan spent a record 73 billion dollars propping up the yen, nearly double anything it had ever done, and within six weeks the currency had slid right back past the level they fought to hold. Intervention buys time. It doesn't change the trend. So take the green for what it is. The AI trade is back in the pool, momentum has flipped positive, and there's money to make today. Just be clear on what it's standing on. Our signal went red midweek, the 30-year yield is at a 19-year high, and a good part of this morning's mood traces back to a currency defense that history says fades. Until that changes, this reads like a bounce, not a turn.

Published Jul 31, 2026Updated Jul 31, 20265 min read
The tape looks great this morning. Amazon's blowout has the tech trade roaring back, Korea's market ripped overnight, and all three of our momentum readings are green again. But the thing actually holding this up is shakier than the screen makes it look. Japan is the reason, and it's worth understanding. Their finance ministry stepped into the currency market yesterday. The yen had been grinding down toward levels it hasn't touched in 40 years, and they moved to prop it up, buying yen and selling dollars to do it. The dollar had its worst day in about four years off the back of that, down roughly 3%. That's the part that reaches us. A weaker dollar loosens financial conditions, and that's a real piece of why stocks took off yesterday and why they're still bid this morning. So the rally we're enjoying is, in part, a product of Japan defending its currency two days ago. The reason we don't lean on it is that the move doesn't fix anything underneath. The yen keeps falling because Japan's interest rates sit far below the rest of the world's, and that gap isn't closing. The Fed held this week and the BOJ is expected to hold too. So traders keep borrowing cheap yen and parking it in higher-paying dollars, earning something like 260 basis points a year to do nothing, and that steady pull drags the yen back down no matter how much Tokyo buys. They've already shown it doesn't last. Back in April and May, Japan spent a record 73 billion dollars propping up the yen, nearly double anything it had ever done, and within six weeks the currency had slid right back past the level they fought to hold. Intervention buys time. It doesn't change the trend. So take the green for what it is. The AI trade is back in the pool, momentum has flipped positive, and there's money to make today. Just be clear on what it's standing on. Our signal went red midweek, the 30-year yield is at a 19-year high, and a good part of this morning's mood traces back to a currency defense that history says fades. Until that changes, this reads like a bounce, not a turn.
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