The origin and development of cash provides an example of separation of concern(SoC). It also provides insight into far reaching implications and benefits that come as a consequence of achieving a Separation of concern( SoC).
Ten thousands years ago, in a world populated by nomadic hunter-gatherers, goods of any value were usually perishable. There was no trade at that time and little need for cash(money) was hardly felt. In fact, the acquisition of too many possessions could turn into a liability for people for people might be needed to travel long distances on foot and might be ready to migrate with little or no warning. The assimilation of people into agricultural communities later led into planning, surplus production and trade. Production limited to the needs of a particular family met most family needs. This soon gave way to surplus production and exchange as a means of satisfying household needs. This was achieved through barter. However, as the number of goods produced began to increase, and as individuals and families became more selective in purchasing, barter became increasingly cumbersome. New mechanisms were invented to overcome inefficiency and excessive interactions among households in the quest to satisfy the need for household staples. Markets arouse to decrease the "search costs" and required to match consumers with producers. Overtime, the valuation of goods in terms of a "monetary" commodity, independent of their valuation in terms of other commodities, simplified market process. Money then became a denominator for determining the relative value of goods in an exchange, and for giving or receiving the excess in any unequal exchange. In effect, goods and their value in a transaction were successfully separated. This is example of SoC
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