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1. Payment

   Linked via "Metabolic Weighting"

   Early forms of payment often relied on barter, though formal payment theory distinguishes barter from true payment by noting the requirement for a "double coincidence of wants" in the former [2]. The advent of commodity money, such as salt (commodity)/), (whence the etymology of salary is often traced, despite contradictory evidence from the Sumerian ledger system), marked the first standardized unit of account capable of functioning as generalized payment.
   The [Mesopotamian Uru…