Deutsche Bank Research's September 2026 Monthly Chartbook, "The Home Straight,"1 arrives at a moment of unusual clarity and unusual tension. Jim Reid, Henry Allen, and Rajsekhar Bhattacharyya survey a global economy running hotter than most forecasters anticipated, where bond markets are repricing history, earnings are breaking out of century-long channels, and artificial intelligence is reshaping capital allocation at a speed that defies easy categorization.
The bond sell-off that has unnerved investors finds important historical perspective in the opening section. Ten-year US Treasury yields, Reid observes, are "only slightly above their long-term average yield since 1800," which stands at 4.5%. Far from extreme, the move reflects a normalization process decades in the making. The more pressing question concerns where yields belong given current nominal growth. With Q2 2026 nominal GDP running at 6.6% year-over-year, the highest reading outside the Covid rebound since 2005, Reid frames the arithmetic directly: if nominal GDP settles at 5.5%, a 10-year yield of roughly 4.8% is historically average; if AI and persistent inflation anchor nominal growth closer to 6%, "around 5.3% is reasonable before factoring in fiscal concerns." The current gap between spot nominal GDP and 10-year yields sits at approximately 180 basis points, a spread that makes it difficult, by the report's own logic, to argue that yields are egregiously high.
Globally, 30-year yields are hitting decade-plus highs in the UK, US, Germany, and Japan, a phenomenon the team characterizes as unambiguously global. Across developed markets, funding costs have now risen above nominal GDP growth on average, reversing the post-GFC regime of financial repression that quietly subsidized high debt loads for more than a decade. For Japan, the shift is particularly acute. Since 2021, Japanese nominal GDP averaged more than 220 basis points above 10-year JGB yields. Today that cushion has narrowed to roughly 40 basis points on a spot basis, threatening the debt-to-GDP improvement that has been one of the more under-appreciated macro stories of the post-Covid period.
On monetary policy, the Fed finds itself in a genuinely difficult position. PCE inflation remains "elevated far above the Fed's 2% target," with core PCE sitting only 15 basis points below its 34-year high. Trend inflation, across multiple Fed and Deutsche Bank measures, appears sticky at approximately 3%. The ISM services prices paid component is at a four-year high, and the report notes it has historically been consistent with CPI above 5% at similar readings. Meanwhile, financial conditions are "broadly bumping up against the loosest they've been since 1990." The insurance cuts of late 2024 and late 2025 have left the policy rate comfortably below most rules-based frameworks, and payrolls, volatile as they have been, show clear signs of trending higher through 2026. Reid is direct: "those insurance cuts look ripe to be reversed." For the ECB, rising energy prices tied to the Iran conflict and deteriorating gas storage levels in Germany heading into winter add a distinct upward inflation risk, with the DB economics team expecting a hike and a further move to 2.75% in December.
The midterm political landscape carries its own macro significance. Democratic odds of retaking the Senate have risen sharply since the Iran conflict lifted inflation and eroded Trump's approval on economic issues. Senate control matters for Fed governor appointments, cabinet confirmations, and Supreme Court seats, and the report flags a meaningful correlation between Brent crude prices and Democratic Senate control probabilities. Seasonally, September is historically the worst month for the S&P 500, and midterm years tend to see weakness into October before a strong recovery. Yet 2026 has defied the pattern, with markets climbing since early August.
On earnings, the picture is striking. Q2 2026 delivered the strongest non-pandemic year-over-year global earnings expansion on record, driven by synchronized cyclical and commodity tailwinds. US earnings per share are breaking out of a 90-year channel, prompting debate about whether this represents a sustainable new plateau or an AI-elevated cycle. The top five S&P 500 capex spenders are now deploying more than double the capital expenditure of the remaining 495 companies combined, with the hyperscalers' spending directly boosting EBITDA for beneficiaries across semiconductors, construction, utilities, and data center REITs.
The AI section carries one of the report's most quietly important observations: despite rising adoption, a large majority of enterprises report no change in workforce size as a direct result. The revolution is augmenting rather than replacing, at least for now.
Five Key Takeaways for Advisors and Investors
1. Yields are not extreme by historical standards, but nominal GDP at 6.6% and sticky trend inflation around 3% argue against assuming rates fall quickly or far.
2. The Fed's insurance cuts appear to have overshot; rate hikes are a more realistic near-term risk than markets currently price.
3. Global earnings breadth and growth are at or near record levels, with the AI capex cycle creating identifiable winners across the supply chain beyond the hyperscalers themselves.
4. Japan warrants attention as a value opportunity: PPP-implied price levels have cheapened dramatically since 2012, the yen remains historically weak, and coordinated BoJ and US Treasury intervention signals a potential structural turn.
5. The 2026 US midterms carry genuine monetary policy implications; Senate control determines who sits on the Fed Board, making election outcomes relevant to fixed income positioning.
Footnote:
1 Reid, Jim, Henry Allen, and Rajsekhar Bhattacharyya. Monthly Chartbook: The Home Straight. Deutsche Bank Research Institute, September 2026.
