Money is omitted in a barter transaction.
As a means of economic exchange, money is a good that is widely acknowledged. It facilitates trade by moving from person to person and country to country, and it serves as the primary indicator of wealth.
Money serves as a medium of exchange, which makes it an advantageous item to own since it spares the holder the time and effort required to synchronize market trades (i.e. by barter). Convenience is a luxury, especially when it entails time savings. If you have the money and are willing to pay the price, you can have everything in a market economy.
Hence the correct option is D
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