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Interestingly coinage has often arisen in many societies as a form of trade superior to bartering, because money is a neutral element to trade. Everyone can want it and everyone can use it.
Consider if your trade is farmer producing milk from cattle. In general you'll have milk and dairy produce and every so often meat/young cattle to trade. However what if your local smith is lactose intolerant and thus doesn't want your main product? Now you can't trade milk with him and meat is only going to happen infrequently. What do you do - does the smith accept dairy produce and then have to go find someone else to go trade that with for something he wants; or is the farmer going to have to go trade dairy for something the smith wants to then trade with the smith.
Such systems can get complicated - what if whilst trading for the item the smith wants, the smith finds it in advance and thus no longer requires it. Just how much time can you dedicate to wheeling and dealing in trading away from your main work.
However if you've traded your dairy for coin all year then you can pay the smith in coin. The smith doesn't need to trade away the coin to make it have value it already has value.
I would also say its possible to have a more fixed concept of relative values in relation to coinage, rather than to produce. Relative values vary a lot person to person so its going to be hard to sometimes come to agreements on what is more or less valuable than the other.
I think that its no shock that so many societies developed some form of money or cash which allowed them to help facilitate trading. Of course its not the only form and some societies did develop around herds being the pure value of a person to trade; though one notices that many of those systems often remained locked in a cycle with limited development for a very long time.
Of course coinage is best used when you've larger social groups; smaller groups are often more dynamic and amenable to more group contributions and have less need to perfectly balance trades in the moment.
Consider if your trade is farmer producing milk from cattle. In general you'll have milk and dairy produce and every so often meat/young cattle to trade. However what if your local smith is lactose intolerant and thus doesn't want your main product? Now you can't trade milk with him and meat is only going to happen infrequently. What do you do - does the smith accept dairy produce and then have to go find someone else to go trade that with for something he wants; or is the farmer going to have to go trade dairy for something the smith wants to then trade with the smith.
Such systems can get complicated - what if whilst trading for the item the smith wants, the smith finds it in advance and thus no longer requires it. Just how much time can you dedicate to wheeling and dealing in trading away from your main work.
However if you've traded your dairy for coin all year then you can pay the smith in coin. The smith doesn't need to trade away the coin to make it have value it already has value.
I would also say its possible to have a more fixed concept of relative values in relation to coinage, rather than to produce. Relative values vary a lot person to person so its going to be hard to sometimes come to agreements on what is more or less valuable than the other.
I think that its no shock that so many societies developed some form of money or cash which allowed them to help facilitate trading. Of course its not the only form and some societies did develop around herds being the pure value of a person to trade; though one notices that many of those systems often remained locked in a cycle with limited development for a very long time.
Of course coinage is best used when you've larger social groups; smaller groups are often more dynamic and amenable to more group contributions and have less need to perfectly balance trades in the moment.