A K-shaped economy becomes dangerous not just from the wealth gap, but when the bottom half is actively regressing—falling behind the rising cost of living. This violation of the human need for progress is the primary trigger for instability, not the mere existence of billionaires.

Inequality itself isn't inherently destructive; it can be a useful incentive for progress. However, societies must avoid "intolerable inequality," a specific threshold where the gap becomes so vast that it predictably triggers societal collapse, a cycle that occurs every 150-250 years.

The subjective experience of suffering can be worse for those who are poor amidst extreme wealth (e.g., homeless in San Francisco) than for those in an environment of shared, absolute poverty. The constant, stark comparison of one's own failure against others' success can create a mental anguish that outweighs objective material hardship.

Wealth inequality alone is not enough to break a society. The true catalyst for social eruption is the combination of extreme inequality with a widespread unaffordability crisis, where basic necessities become unobtainable for the majority. This "two-sided squeeze" creates the explosive pressure that leads to revolt.

Our brains are wired to measure success relative to our peers, not in absolute terms. Even if future generations live with technology and medicine we can't fathom, they won't feel happier because their baseline expectations will have shifted, and they'll still be comparing themselves to others.

A major source of modern anxiety is the tendency to benchmark one's life against a minuscule fraction of outliers—the world's most famous and wealthy people. This creates a distorted view of success. Shifting focus to the vast majority of humanity provides a healthier perspective.

The ability to print money creates inflation that widens the wealth gap. This hyper-inequality triggers a deep-seated, evolutionary psychological response against unfairness, which then manifests as widespread social unrest and societal breakdown.

Throughout history, a large gap between the 'haves' and 'have-nots' is a recipe for revolution. This economic disparity fuels populism and social unrest more profoundly and consistently than external shocks like pandemics, technological disruption like AI, or even war.

Despite data showing immense long-term progress, public sentiment is often negative. This disconnect arises because people judge their well-being relative to others, not to past generations. When economic gains are not broadly shared, the feeling of falling behind outweighs the reality of absolute improvement.