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Chapter 3- Demand and Supply
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19
Economics
Undergraduate 2
12/07/2011

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Term
The law of demand states
Definition
"Other things remaining the same, the higher the price of a good, the smaller is the quantity demanded; and the lower the price of a good, the greater is the quantity demanded"
Term
Higher price influences the quantity demanded because of 2 reasons:
Definition
-Substitution effect
-Income effect
Term
Substitution effect
Definition
When the relative prices (opportunity cost) of a good rises, people seek substitutes for it, so the quantity demanded of the good or service decreases
Term
Income effect
Definition
When the price of a good or service rises relative to income, people cannot afford all the things they previously bought, so the quantity demanded of the good or service decreases
Term
Demand curve
Definition
-shows the relationship between the quantity demanded of a good and its price when all other influences on consumers' planned purchases remain the same
-also a willingness-and-ability-to-pay curve: tells us maximum someone is willing to pay for an additional unit
Term
Change in demand
Definition
when any factor that influences buying plans changes, other than the price of the good, there is a change demand for that good
Term
Six main causes for change in demand (other than price)
Definition
1)The price of related goods: substitute and complement
2)Expected future prices
3) Income of buyers
4) Expected future income
5) Population of buyers
6) Preferences of buyers
Term
Movement along the demand curve
Definition
-if the price of the good changes but no other influence on buying plans changes
-shows a change in the quantity demanded
Term
Shift of the Demand Curve
Definition
-if the price of the good remains the same but one of the other influences on buyers' plans changes
-shows a change in demand
Term
Shift of the Demand Curve
Definition
-if the price of the good remains the same but one of the other influences on buyers' plans changes
-shows a change in demand
Term
The Law of Supply
Definition
"Other things remaining the same, the higher the price of a good, the greater is the quantity supplied, and the lower the price of a good, the smaller is the quantity supplied
-results from the general tendency for the MC of producing a good or service to increase as the quantity produced increases
Term
Supply curve
Definition
Shows the relationship between the quantity supplied of a good and its price when all other influences on producers' planned sales remain the same
-refers to the entire relationship between the quantity supplied and the price of a good
-also a minimum-supply-price curve: shows the lowest price at which someone is willing to sell
Term
Change in supply
Definition
when any factor that influences selling plans other than the price of the good changes
Term
6 main factors for supply change
Definition
1) Prices of factors of production
2) Prices of related goods produced
3) Expected future prices
4) Number of suppliers
5) Technology
6) State of nature
Term
Movement along the supply curve
Definition
when the price of the good changes and other influences on sellers' stays the same
-shows a change in the quantity supplied of that good
Term
Shift of the supply curve
Definition
if the price remains the same but some other influence on sellers' part changes
-shows a change in supply
Term
Equilibrium in a market
Definition
occurs when a market occurs when the opposing forces of buyers and sellers on price are balanced
Term
Equilibrium price
Definition
the price at which the quantity demanded equals the quantity supplied
-at equilibrium price, buyers' plans and sellers' plans agree and the price doesn't change until some event changes either demand or supply
Term
Equilibrium quantity
Definition
the quantity bought and sold at the equilibrium price..
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