(Figure: Price and Quantity of Turkeys I) Mathematically, the demand curve D1 is described by this equation: 
Definitions:
Equilibrium Quantity
The quantity of goods or services that is supplied and demanded at the equilibrium price, where supply equals demand in a market.
Equilibrium Price
The cost at which the amount of products offered matches the amount of products requested.
Equilibrium Quantity
The quantity of goods supplied that is exactly equal to the quantity of goods demanded at the market equilibrium price.
Invisible Hand Principle
Adam Smith's concept that self-interested behaviors in a free-market economy lead to economic benefits for all.
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