In a barter-based economy, transactions require that each party have something the other desires. Money increases market efficiency by serving as a common commodity everyone wants. now a transaction requires only that the seller has something the buyer desires and that the buyer has enough money to pay the seller's asking price.
This refers to the allocation of scarce resources in a given geographical area to the people there.
Hence, we can see that the words have been filled correctly above as:
In a barter-based economy, transactions require that each party have something the other desires
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