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”Milking cows” that were a kind of currency

Base data: currency.
Standard of value evaluation in ancient Ireland

Only in an ancient society based on cattle-breeding

In ancient Ireland, milking cows were used to determine the trading and compensation value of goods. One milking cow was “1 sed” and three were equal to “1 cumal”. So, in other words, 3 seds are equivalent to 1 cumal. It’s a bit of a primitive value system unique to an ancient society based on cattle-breeding.