September's key developments included resilient economic growth despite rising interest rates and oil prices, a widening divide between mega-cap technology shares and smaller companies, and continued oil flows through the Strait of Hormuz. Portfolio considerations examine how AI infrastructure investment is intensifying competition for capital, the relationship between economic growth and government debt, and whether moderating energy prices could limit the need for further Federal Reserve rate hikes.
From the original report
Selected passages from the original publication. Historical observations reflect the report's publication date, not current market advice.
1) Higher Everything? – Economic growth, interest rates, and oil prices all surged in September. Payrolls rose 162K (consensus ~55K), core retail sales jumped 1.4%, and flash PMIs hit their highest since 2021 – even as 10-year yields leapt 55bp to 5.30% and crude held above $100. Growth is powering through costlier energy AND costlier money.
2) Bigger was Better – The S&P 500’s modest 0.45% dip masked an equal-weight index down 5.2% and the Russell 2000’s worst month since early 2025. Smaller companies are sensitive to rising rates, while mega-caps are both protagonists and beneficiaries of the AI capex boom. META rose 26.7%, with tech and communications the only positive sectors.
3) Strait Flush – Oil keeps escaping the Strait of Hormuz in quantities far greater than had been thought possible (by some metrics approaching pre-war levels) via “dark crossings” through the US-protected Omani Corridor. With crude still above $100, markets must be questioning how durable these flows could truly be.
What, me worry? – A surge in demand for capital has flipped the world from the Bernanke-era “savings glut” into capital scarcity. To fund the AI-driven buildout of computing power, other uses of capital must get priced out. AI investment paybacks can be as short as two years, in which case it hardly matters whether money costs 8% or 12%. Purchases of homes, autos, and durables must go to the back of the line, as only the strongest uses of capital will survive. Deficit concerns, meanwhile, may be overblown as a driver of current rate moves. While overall debt continues to rise, with nominal GDP growing at 6 to 7%, debt can grow at a similar pace and debt-to-GDP stays constant. If growth accelerates once we clear the “J-curve” of AI investment, debt ratios could even come decline.
For educational purposes only; not individualized investment, tax, or legal advice. Investing involves risk, including loss of principal.
The original PDF is available as an optional companion to this public article. Use the download form below to access the document.