Money is an external record of having rendered service and delivered goods to neighbors. Before communities grow beyond a couple hundred people, money is redundant with the human capacity to share fairly and remember the generosity and goodwill of others, but it becomes essential when communities blend and grow in to the thousands.

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Yes, because communication breaks down.

I wouldn't call it a breakdown so much as a limit to the human memory and social dynamics. It's far more efficient to use an external record than to recall social interactions with hundreds of people, especially commercial interaction.