Societies with rampant polygyny suffered from "young male syndrome"—a surplus of unpartnered men causing chaos. Adopting monogamy as a cultural norm gave these men a stake in society, redirecting their energy from competition and violence towards family and community building, ultimately allowing those cultures to flourish.

The Reformation enabled the Enlightenment not because its doctrine was inherently progressive—early Protestantism was often fundamentalist—but because it broke the Catholic Church's intellectual monopoly. This fracture created a marketplace of ideas where different philosophies could compete, and forced societies to find ways to coexist with disagreement.

Protestantism offered a direct route to heaven through good deeds and faith, eliminating the need to pay the Catholic Church for "indulgences." This reframes a major religious schism as an appealing financial proposition for a populace being heavily taxed for salvation.

Contrary to popular belief, Christianity's monogamy isn't rooted in Judaism, which practiced polygyny. Instead, it was a strategic adoption of the prevailing Greco-Roman norm, a move crucial for the new religion to be taken seriously and spread within that society.

The Catholic Church financed the printing press to increase revenue, blind to its second-order effects. The same technology was later used by Martin Luther to mass-produce pamphlets that ignited the Protestant Reformation, undermining the church's authority.

The first corporations in Ancient Rome were private companies contracted for state functions like tax collection and equipping armies. As their power grew, they bribed senators, encouraged wars, and backed politicians who dismantled the Republic, providing a stark historical warning about the alignment of corporate and state interests.

Europe's nuclear family was too small to provide local public goods, spurring the creation of corporations like universities and guilds. In contrast, China's powerful, extended clans fulfilled these roles. This fundamental difference in social organization, not just technology or politics, was a key driver of the great divergence between the two regions.

Once clergy were mandated to be celibate in the 12th century, the laity became the sole group sanctioned to practice sex. This logical division forced a theological shift, defining lay marriage primarily by its openness to procreation, a concept not central before this period.

Unlike a unified China, which could halt nationwide projects like shipbuilding on a whim, Europe's division into competing kingdoms created a resilient ecosystem for progress. If one nation abandoned an idea or technology, another could pick it up, fostering continuous development driven by interstate competition.