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University of Colorado
University of Colorado: Demand, Supply, and Markets
This site discusses in great detail the differences between demand, supply, and markets. Useful economic terminology is identified in bold.
Khan Academy
Khan Academy: Law of Demand
If the price of something goes up, people are going to buy less of it.
Khan Academy
Khan Academy: Law of Supply
If the price of something goes up, companies are willing (and able) to produce more of it.