The move from defined-benefit pensions to defined-contribution 401(k)s forced individuals to over-accumulate assets to guard against an unknown lifespan. This created a massive, structural, and inflationary demand for financial assets, as everyone must plan for a worst-case retirement scenario.

Contrary to popular belief, earnings growth has a very low correlation with decadal stock returns. The primary driver is the change in the valuation multiple (e.g., P/E ratio expansion or contraction). The correlation between 10-year real returns and 10-year valuation changes is a staggering 0.9, while it is tiny for earnings growth.

With 34% of US household wealth in equities—the highest on record and more than real estate (26%)—the traditional separation between the market and the economy has vanished. A major market downturn would create an immediate, severe negative wealth effect, directly impacting consumption and triggering a recession.

The S&P 500 is hitting all-time highs amidst a severe energy crisis because soaring global money supply is overriding fundamental risks. This liquidity floods into financial assets as real economy activity (money velocity) slows, creating a major disconnect between markets and reality.

A major disconnect exists between Wall Street and Main Street. While jobs data points towards a potential recession, the S&P 500 is hitting record highs. Since recessions are historically preceded by market downturns, investors are signaling a strong disbelief in the negative labor market signals.

Investors are piling into equities not because they are bullish on corporate profits, but because traditional safe havens have become unreliable. This "There Is No Alternative" (TINA) scenario, where buying is driven by a lack of options rather than fundamentals, is a classic precondition for an asset bubble and potential crash.

The stock market has fundamentally transformed. From the nation's founding until the 1980s, it was a dividend-generating vehicle, with income comprising 96% of total returns. Since then, it has become almost purely an instrument for price appreciation, a completely different function.

The stock market is not overvalued based on historical metrics; it's a forward-looking mechanism pricing in massive future productivity gains from AI and deregulation. Investors are betting on a fundamentally more efficient economy, justifying valuations that seem detached from today's reality.

Contrary to a common myth, high equity valuations do not reliably revert to a historical mean. An analysis of 32 different valuation scenarios found only one case of statistically significant mean reversion. Structural economic shifts, like reduced GDP volatility since the 1990s, justify higher sustained valuation levels.