Harari's main argument is that Sapiens came to dominate the world because it is the only animal that can cooperate flexibly in large numbers. He argues that prehistoric Sapiens were a key cause of the extinction of other human species such as the Neanderthals, along with numerous other megafauna. He further argues that the ability of Sapiens to cooperate in large numbers arises from its unique capacity to believe in things existing purely in the imagination, such as godsnationsmoney, and human rights.

Harari claims that all large-scale human cooperation systems – including religionspolitical structurestrade networks, and legal institutions – owe their emergence to Sapiens' distinctive cognitive capacity for fiction. Accordingly, Harari regards money as a system of mutual trust.

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https://en.wikipedia.org/wiki/Sapiens:_A_Brief_History_of_Humankind