Current AI-driven equity valuations are not a repeat of the 1990s dot-com bubble because of fundamentally stronger companies. Today's major index components have net margins around 14%, compared to just 8% during the 90s bubble. This superior profitability and cash flow, along with a favorable policy backdrop, supports higher multiples.

The claim of an AI-driven productivity boom is suspect when compared to the 1990s. Key indicators are moving in the wrong direction: prices for tech commodities like software and chips are rising instead of falling, and real income growth is weak, not accelerating.

Contrary to historical mean reversion, U.S. corporate profit margins are now durably higher. This structural shift is not a temporary anomaly but the result of decades of falling interest rates, lower corporate taxes, and the economic dominance of high-margin, capital-light technology businesses.

A significant disconnect exists between strong GDP growth and stagnant job creation. This indicates economic expansion is being driven purely by productivity, likely from AI and capital spending, rather than a healthy, expanding labor force. This model may not be sustainable or broadly beneficial.

It's possible to have strong GDP growth without a corresponding drop in unemployment. Goldman Sachs' forecast squares this by pointing to accelerating productivity growth, meaning the economy can expand its output without necessarily hiring more workers.

Traditional metrics like GDP fail to capture the value of intangibles from the digital economy. Profit margins, which reflect real-world productivity gains from technology, provide a more accurate and immediate measure of its true economic impact.

Free cash flow has outpaced earnings growth primarily for two reasons: a smaller share of corporate output is going to labor wages, and firms have been able to generate profits without significant capital expenditure. This surplus cash flows directly to shareholders, boosting valuations.

The combination of solid GDP growth and weaker job creation is not necessarily a warning sign, but a structural shift. With productivity growth rebounding to its 2% historical average and labor supply constrained by lower immigration, the economy can grow robustly without adding as many jobs as in the past.

Even when a company's sales are rising, a decrease in profit margins indicates underlying weakness. Wall Street interprets this as a sign of lost pricing power and the need to offer discounts to compete, signaling long-term trouble for the stock.