Mostly good. However the initial idea that people who were living in cities needed a way to plan for the future and have accounting, places the consequence in front of the predicate. Like saying that people domesticated wolves. In reality wolves which were more tolerant of being near people began to trust people who provided food. The wolves selected people, not the converse. Similarly, people began living in cities because they devised ways to cooperate, to plan and to provide security - both physical and actuarial. Cooperating to live in groups larger than small families, clans or tribes was a symbiosis, all tangled together.