Helena is using money as a unit of account.
Money is anything that is accepted and used as a means of payment for products and it used to repay debts.
Functions of money
- Unit of account : it is used to value goods and services. Helena values her scarves as $20.
- Medium of exchange : money can be used to exchange for goods and services. For example, the person who buys the scarves for $20 uses money as a medium of exchange.
- Store of value : money can be kept for extended periods and it would not lose its value.
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