Ed Yardeni is looking past the latest anxiety over artificial intelligence spending and finding reassurance in a market theory more than a century old. Dow Theory, he says, remains bullish because both industrial and transportation stocks are trading near record territory.
The theory rests on a simple proposition: companies making goods and companies moving them should advance together when economic strength is real. If industrial stocks rally while transportation shares lag, the market may be celebrating a story that the physical economy cannot confirm. Right now, Yardeni sees confirmation rather than contradiction.
The surprise is where some of that strength is coming from. Investors have spent months worrying that hyperscalers are pouring too much money into data centers, chips and supporting infrastructure, but the spending is also creating business for railroads and industrial suppliers that must move steel, concrete, transformers and cooling equipment across the country.
That gives Yardeni a different reading of the AI capital expenditure boom. Money that appears to be disappearing from Big Tech free cash flow is not vanishing; it is moving through the economy and showing up in the earnings expectations of companies that build and transport the physical foundation of artificial intelligence.
Rail revenue estimates have risen sharply, and forward earnings for the group have moved to record highs after years of stagnation. Transportation stocks have even outperformed the technology-heavy Nasdaq, giving the old Dow Theory relationship a distinctly modern engine.
Yardeni is not arguing that the market is risk-free. Transportation valuations are elevated, and higher fuel costs could pressure margins. His point is that the bull market still has breadth beneath the anxiety, with industrial activity confirming rather than undermining the advance.
Wall Street has become accustomed to treating every market question as an AI question. Yardeni’s century-old signal suggests the more revealing answer may be found in the rail yards carrying the boom from one construction site to the next.