Examlex
Find the midpoint of the line segment joining the points
and
Money Economy
A system in which goods and services are traded using money as a medium of exchange rather than barter.
Barter Economy
An economic system where goods and services are exchanged directly for other goods and services without using money.
Double Coincidence
A situation in a barter system where two parties each hold an item the other wants, facilitating an exchange without the need for money.
Barter
The exchange of one good or service for another good or service; a trade.
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