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USA National Standards for Concept "Demand"

National Standard Number: 7
Markets exist when buyers and sellers interact. This interaction determines market prices and thereby allocates scarce goods and services.
Online lessons on US Standard 7 from the National Council on Economic Education Website.

National Standard Number: 8
Prices send signals and provide incentives to buyers and sellers. When supply or demand changes, market prices adjust, affecting incentives.
Online lessons on US Standard 8 from the National Council on Economic Education Website.