The economic theory that rising asset values boost spending is flawed. It ignores 'mental accounting'—people treat different types of wealth differently. A rise in home value leads to almost zero increased spending, while a cash windfall from a stock sale or lottery win is spent freely. The source of wealth dictates its use.

The underperformance of some consumer discretionary stocks is directly linked to financial pressure on lower-income and younger households. Meanwhile, sectors exposed to more resilient high-income consumers have held up better. A broader consumer recovery, spurred by tariff relief or cooling inflation, is needed to improve returns in these lagging market segments.

The resilience of consumer spending, despite weak employment growth, is driven by affluent consumers liquidating assets or drawing down cash. This balance sheet-driven consumption explains why traditional income-based models (like savings rates) are failing to predict a slowdown.

Beyond basic needs, consumption is driven by how people feel about their future. Banga illustrates this with New York City diners buying more expensive wine on days the stock market performs well, showing a direct link between psychological optimism and spending habits at higher income levels.

The top 10% of earners, who drive 50% of consumer spending, can slash discretionary purchases overnight based on stock market fluctuations. This makes the economy more volatile than one supported by the stable, non-discretionary spending of the middle class, creating systemic fragility.

Analysis reveals a heavy concentration of spending at the top: the highest decile of income earners is now responsible for 49.2% of all personal outlays. This makes the overall US economy highly dependent on the financial health and confidence of a very small, affluent segment of the population, increasing systemic risk.

The economy is now driven by high-income earners whose spending fluctuates with the stock market. Unlike historical recessions, a significant market downturn is now a prerequisite for a broader economic recession, as equities must fall to curtail spending from this key demographic.

The personal saving rate has dropped dramatically to 3.5%, fueled by the stock market wealth effect. This is historically low and below equilibrium, suggesting that consumers cannot continue to fuel economic growth by saving less and the current spending pace is unsustainable.

Aggregate US consumer strength is misleadingly propped up by the top 40% of upper-income households, whose spending is buoyed by appreciating assets. This masks weaknesses among lower- and middle-income groups who are more affected by inflation, creating a narrowly driven economic expansion.