Which aspect of money allows it to facilitate trade?

The aspect of money that facilitates trade is its function as a medium of exchange. This role is crucial because it allows people to buy and sell goods and services without the complications of barter systems, where a direct trade of goods for goods is required. With money serving as a medium of exchange, individuals can determine the value of goods and services in a standardized currency, simplifying transactions.

This function eliminates the need for a double coincidence of wants, which means that both parties must want what the other has for a barter to work. By accepting money as payment, sellers can use that same money to purchase what they need from others, thus making trade efficient and practical.

In contrast, while the unit of account function allows for the measurement of value and the store of value function helps maintain purchasing power over time, these aspects do not directly contribute to the ease of trading goods and services. Liquidity refers to how easily an asset can be converted into cash, which supports trade but also does not inherently facilitate the exchange process the way being a medium of exchange does.