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Microeconomics: Demand, Supply, and Equilibrium

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  • Perfectly competitive market

    A market where sellers sell identical goods and no individual buyer or seller can influence the market price.

  • Demand curve

    Plots the relationship between the market price and the quantity of a good demanded by buyers.

  • Supply curve

    Plots the relationship between the market price and the quantity of a good supplied by sellers.

  • Competitive equilibrium price

    The price at which the quantity demanded equals the quantity supplied in a market.

  • Quantity demanded

    The amount of a good buyers are willing to purchase at a given price.

  • Demand schedule

    A table showing the quantity demanded at different prices, holding all else equal.

  • Market demand curve

    The sum of individual demand curves of all buyers, showing total quantity demanded at each price.

  • Law of Demand

    Quantity demanded rises when price falls, holding all else equal.

  • Shifts of the demand curve

    Caused by changes in tastes, income, prices of related goods, number of buyers, or expectations about the future.

  • Movement along the demand curve

    Caused only by a change in the product's own price.

  • Quantity supplied

    The amount of a good sellers are willing to sell at a given price.

  • Supply schedule

    A table showing the quantity supplied at different prices.

  • Market supply curve

    Plots the total quantity supplied by all sellers at each market price.

  • Law of Supply

    Quantity supplied rises when price rises, holding all else equal.

  • Shifts of the supply curve

    Caused by changes in input prices, technology, number of sellers, or sellers' expectations about the future.

  • Movement along the supply curve

    Caused only by a change in the product's own price.

  • Competitive equilibrium

    The market price and quantity where quantity demanded equals quantity supplied.

  • Excess demand

    Occurs when consumers want more than suppliers provide at a given price, causing a shortage.

  • Excess supply

    Occurs when suppliers provide more than consumers want at a given price, causing a surplus.

  • Effect of a leftward shift in supply curve

    Decreases supply, raising equilibrium price and lowering equilibrium quantity.

  • Effect of a rightward shift in supply curve

    Increases supply, lowering equilibrium price and raising equilibrium quantity.

  • Effect of a leftward shift in demand curve

    Decreases demand, lowering equilibrium price and quantity.

  • Effect of simultaneous rightward shift in supply and leftward shift in demand

    Equilibrium price falls; equilibrium quantity change depends on magnitude of shifts.

  • Substitutes and complements

    Related goods whose price changes can shift the demand curve for a good.

  • Normal goods vs Inferior goods

    Normal goods see demand rise with income; inferior goods see demand fall as income rises.

  • Impact of government price controls

    Price ceilings or floors prevent prices from reaching equilibrium, causing shortages or surpluses.

  • Aggregation of individual demand schedules

    Summing quantities demanded by all buyers at each price to form the market demand schedule.

  • Aggregation of individual supply schedules

    Summing quantities supplied by all sellers at each price to form the market supply schedule.

  • Input prices effect on supply

    Higher input prices shift supply curve left; lower input prices shift it right.