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.

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While necessary to refinance national debt, lowering interest rates has a severe side effect: it fuels a "K-shaped" economy. The resulting inflation enriches those who own assets like stocks and real estate while simultaneously punishing wage earners and savers, thus widening the wealth gap.

The disconnect between strong GDP data and public dissatisfaction (the 'vibe-cession') is because wealth gains are concentrated at the top while median outcomes worsen. This K-shaped dynamic is politically unsustainable, forcing politicians away from supply-side policies and toward more populist, and often inflationary, measures.

Consumer spending resilience is not broad-based. It's largely driven by the top 10% of income earners (making over $275k), who now account for almost 50% of total spending. This is the only cohort whose spending has outpaced inflation since the pandemic, making the wider economy highly sensitive to their behavior.

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.

While many households struggle, data showing a 9% year-over-year growth in OpenTable seated diner reservations points to a resilient, high-spending consumer segment. This divergence in spending habits is a key real-time indicator of a "K-shaped" economy, where the affluent are far less affected by broader economic pressures.

The U.S. economy can no longer be analyzed as a single entity. It has split into two distinct economies: one for the thriving top tier (e.g., AI and tech) and another for the struggling bottom 60%. The entire system now depends on spending from the rich; if they stop, the economy collapses.

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.

Analysis of delinquency rates revealed that high-income earners were initially seeing the fastest increases. The key differentiator for financial stability was not income but wealth, particularly homeownership, which provided a financial cushion against economic shocks.

With the top 10% of earners accounting for half of all consumer spending, the U.S. economy has become dangerously top-heavy. This concentration creates systemic risk, as a stock market downturn or even a minor shift toward caution among this small group could trigger a sharp recession, with no offsetting demand from the rest of the population.

The economy's apparent strength is misleadingly concentrated. Growth hinges on AI-related capital expenditures and spending by the top 20% of households. This narrow base makes the economy fragile and vulnerable to a single shock in these specific areas, as there is little diversity to absorb a downturn.