The Square and the Tower

Niall Ferguson's 2017 book proposes that human history is best understood as the interaction between two organizational forms: hierarchies (towers) and networks (squares). Ferguson traces this tension from the printing press through the Reformation, the scientific revolution, the French Revolution, and up to the Internet age, arguing that networks periodically disrupt hierarchies, only to eventually ossify into new hierarchies of their own. The book is a synthesis of network theory applied to macro history.

Andreessen called it "the book I am most looking forward to," describing it as being "on the rise and fall and rise of networks and the eternal battle between networks and hierarchies at all levels of human life." This is the single most directly applicable mental model from the a16z reading list to how technology startups operate.

Every startup is a network attempting to disrupt a hierarchy. Ferguson's historical lens — from the Freemasons to the Arab Spring, from the Medici to the internet — shows that networks consistently outperform hierarchies in the early stages of any transformation, but that successful networks inevitably consolidate into hierarchies. The founder learns two things: first, that the structural advantage of a startup is that it operates as a network while the incumbent operates as a hierarchy; second, that the company's own eventual sclerosis into hierarchy is a predictable trap to actively manage against.