| http://www.w3.org/ns/prov#value | - people buy something one day and pay for it later, and the repayment is denoted in terms of money ??? ??? ??? store of value the function that money serves when people keep money for some period instead of spending it or investing it ??? ??? ??? transaction costs costs of trading, such as time spent shopping and negotiating ??? ??? ??? unit of account the function that money serves when prices are
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