In the scenario described, cattle primarily function as:
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Medium of exchange - Cattle are widely accepted as payment for goods and services, serving the role of facilitating transactions.
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Unit of account - Goods and services are priced in terms of cattle, allowing for a common measure to compare values.
Cattle do not serve well as a store of value due to their varying quality and depreciation with age, and they are also not particularly portable because they are difficult to move over long distances. Therefore, the correct answers are medium of exchange and unit of account.