S&P 500 高於200日均線約6.5%，元大台灣50高於200日均線超過27%，日股（EWJ）高於200日均線約8.8%。三個數字擺在一起，結論很直白：全球主要股市都還在多頭軌道上，而且台股領先幅度大到有點誇張。

技術面好看，不代表底層的錢在安分。這禮拜真正有意思的變化，不在股價，在匯率和利率的縫隙裡。

健康檢查表都正常，問題出在別的科室

先講總經數據，因為它們確實漂亮。美國高收益債信用利差落在2.71%的低檔，芝加哥聯準會金融狀況指數（NFCI）報-0.564，代表整體金融環境偏寬鬆。殖利率曲線10年期減2年期利差回到+0.39%，正常化的擴張走勢，教科書式的「衰退風險很低」訊號都到齊了。

體檢報告正常，不代表沒有變數在排隊。這禮拜排隊的變數，一個叫美元回購，一個叫日本升息。

美元的兩個壓力源

渣打私銀本週報告點出，美元正面臨下行風險，主因是市場擔憂美國財政部擴大公債回購（Treasury buyback expansion）。同一時間，日本央行升息與貨幣政策收緊的預期持續發酵，把美元兌日圓推向下行。這兩件事表面上各管各的，一個是美國國內財政操作，一個是日本央行的貨幣政策路徑，但最後都匯到同一條河——美元的相對強弱。

換個角度想：日圓升值預期升溫，等於跨國套利交易（Carry Trade）的成本結構在鬆動。過去幾年靠著借日圓、換高息貨幣賺利差的資金，現在得重新算一次帳。渣打同步啟動看多歐元兌英鎊（EUR/GBP）的交易觀點，某種程度上就是在替這場利差重新洗牌先卡位。

台股的順風，不是自己吹的

台股這波超過27%的乖離，背後撐盤的是半導體與AI供應鏈的基本面，不是單純情緒堆出來的。這點值得分開來看：多頭氛圍是全球共振的結果，但台股領先的幅度，跟本地產業結構直接相關。把兩件事混著講，容易誤判——氣氛好的時候什麼股票都會漲一點，但漲得比別人多，得靠真正的產業支撐才行。

操作上該盯什麼

多頭格局沒有變，這是本週最不需要爭論的結論。真正該花時間盯的，是美日利差怎麼變、美元兌日圓怎麼走、還有美元因為回購疑慮而產生的波動，會不會反過來牽動全球資金的流向。順著趨勢走沒問題，但風險管理不能因為指數還在高檔就鬆手。9月的下半場，日圓和美元的每一次跳動，都值得多看一眼。

— 胡凱翊

Bull Markets Are Fine. Watch the Yen and the Dollar Instead

S&P 500 is running about 6.5% above its 200-day moving average. Taiwan’s Yuanta Taiwan 50 ETF is sitting more than 27% above the same line. Japan’s EWJ is roughly 8.8% clear of it. Put those three numbers side by side and the read is simple: global equities remain in a bull trend, and Taiwan is running noticeably hotter than the rest.

Clean technicals don’t mean the money underneath is behaving. The real story this week isn’t in stock prices — it’s in the gap opening up between currencies and rates.

The Vitals Look Fine. The Trouble Is Elsewhere

Start with the macro numbers, because they’re genuinely good. US high-yield credit spreads sit at a low 2.71%. The Chicago Fed’s National Financial Conditions Index reads -0.564, signaling loose financial conditions. The yield curve — 10-year minus 2-year — has normalized to +0.39%. Every textbook signal for low recession risk is checked off.

None of that means the queue of variables is empty. Two items are lining up this week: US Treasury buybacks, and Japanese rate hikes.

Two Pressure Points on the Dollar

Standard Chartered Private Bank’s latest note flags downside risk for the US dollar, driven mainly by market concern over Treasury buyback expansion. At the same time, expectations that the Bank of Japan will keep tightening policy are pushing USD/JPY lower. On the surface these are unrelated — one is a US fiscal operation, the other a Japanese monetary policy path — but they both feed into the same river: the dollar’s relative strength.

Flip it around: rising expectations for yen appreciation loosen the cost structure behind cross-border carry trades. Capital that spent years borrowing yen to chase higher-yielding currencies now has to redo the math. Standard Chartered has simultaneously opened a long position on EUR/GBP — in effect, staking a claim ahead of this repricing.

Taiwan’s Tailwind Isn’t Self-Generated

Taiwan’s 27%-plus deviation is backed by semiconductor and AI supply chain fundamentals, not sentiment alone. Worth separating the two: the bullish mood is a global phenomenon, but Taiwan’s outsized lead traces directly to its industrial structure. Blend them together and the signal gets misread — good sentiment lifts everything a little, but outperforming the pack requires real industry underneath.

What Actually Needs Watching

The bull trend isn’t in question this week. What deserves the attention is how the US-Japan rate differential moves, where USD/JPY goes next, and whether dollar volatility tied to buyback concerns starts redirecting global capital flows. Riding the trend is fine. Risk management shouldn’t loosen just because the index is sitting near highs. Every tick in the yen and the dollar through the rest of September is worth a second look.

— 胡凱翊

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