Explanation:

- Paper currency: This consists of banknotes that are used for everyday transactions and are issued by a country's central bank.

- Coins: These are metallic forms of money, typically issued by the government, and used along with paper currency.

- Demand Deposits: These are bank account balances that can be accessed on demand, such as checking accounts, which are used for transactions like withdrawals and payments.

Option 4: All of these – The money supply typically includes paper currency, coins, and demand deposits, as they all contribute to the country's available money for transactions.

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