Stable marriage is increasingly correlated with high income. While 75% of men in the top income quintile marry, only 25% in the bottom quintile do. This reframes the decline of marriage not as a cultural choice, but as a clear marker of economic class division.

Strategies that make mating more difficult—such as devaluing marriage or masculinity—create a hostile environment. While this hurts everyone, it harms those with lower mate quality more severely, raising the bar for entry and creating a relative reproductive advantage for the elite.

Research shows social determinants of health, dictated by your location, have a greater impact on your well-being and lifespan than your DNA. These factors include access to quality food, medical care, and environmental safety, highlighting deep systemic inequalities in healthcare outcomes.

People tend to marry and befriend those who are genetically similar, a process that amplifies genetic inequality in the next generation. This is compounded by geographic sorting, where individuals with genetic propensities for success migrate away from disadvantaged areas, leaving them 'doubly disadvantaged, genetically and environmentally.'

A study by sociologist Emma Zhang found an older sibling's arbitrary academic advantage (from being old for their grade) boosts the younger sibling's performance. This demonstrates a powerful non-genetic, non-parental mechanism through which family-level advantages compound and perpetuate broader societal inequality.

China's plummeting birth rate is not just about cost. It's a structural issue where highly educated, professional women are opting out of childbirth because male partners are not stepping up to equally share the temporal and financial costs, creating a significant "parenthood penalty" for women.

Sociological data reveals a "marriage benefit imbalance" where married men become healthier and wealthier, while married women decline on these metrics by a nearly equal measure. This reflects a societal pattern where women are conditioned to transfer their life force to others.

Animal studies suggest that when a mother's protein intake is low, it sends an epigenetic signal to the baby to "keep your muscles small" in anticipation of a nutrient-scarce world. This programming can result in smaller muscle mass throughout the child's life.

In subsistence societies, women invest all resources into their own offspring. Only in affluent, safe societies do women accrue enough surplus resources (time, energy, capital) to make investing in the suppression of rivals a more adaptive strategy than investing further in their own reproduction.