Shifts in Demand and Supply Study Pack

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Last updated May 21, 2026

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Shifts in Demand and Supply Study Guide

Trace the forces that move entire demand and supply curves — not just prices — and learn to distinguish a true curve shift from a movement along it. This pack covers all six demand shifters and key supply shifters, from input costs and technology to consumer expectations, showing how each affects equilibrium price and quantity.

Key Takeaways

  • •A shift in demand occurs when a non-price factor causes consumers to buy more or less of a good at every possible price, moving the entire demand curve left or right.
  • •A shift in supply occurs when a non-price factor changes how much producers are willing and able to offer at every price, moving the entire supply curve left or right.
  • •The six main demand shifters are income, prices of related goods, consumer tastes, population size, expectations about future prices, and changes in the composition of buyers.
  • •The key supply shifters include input costs, technology, the number of sellers, government taxes and subsidies, natural conditions, and producer expectations.
  • •When demand increases and supply stays constant, equilibrium price and quantity both rise; when supply increases and demand stays constant, equilibrium price falls while quantity rises.
  • •Distinguishing a shift of the curve from a movement along the curve is critical: only a price change causes movement along a fixed curve, while non-price factors shift the entire curve.

Movement Along a Curve vs. a Shift of the Curve

One of the most important distinctions in supply-and-demand analysis is understanding whether a change in market conditions produces a movement along an existing curve or relocates the entire curve to a new position.

Movement Along the Demand or Supply Curve

  • •A movement along the demand curve happens exclusively when the price of the good itself changes — for example, a drop in the price of gasoline leads consumers to purchase more gasoline, moving down along the same demand curve.
  • •A movement along the supply curve occurs when the product's own price changes, prompting producers to offer a different quantity while all other production conditions remain unchanged.
  • •These movements do not indicate a new market situation; they simply reflect how quantity demanded or supplied responds to a price change within the existing relationship.

Shifting the Entire Curve

  • •A shift means the relationship between price and quantity has fundamentally changed — at every price level, consumers want more (rightward shift) or less (leftward shift) than before.
  • •For supply, a rightward shift means producers are willing to supply more at every price; a leftward shift means they supply less at every price.
  • •Shifts are always caused by factors other than the good's own price, collectively called non-price determinants.

Non-Price Determinants of Demand

Six categories of factors can shift the entire demand curve by changing how much consumers are willing and able to purchase at any given price.

Income and Normal vs. Inferior Goods

  • •For a normal good — such as restaurant meals or new clothing — an increase in consumer income raises demand, shifting the curve rightward.
  • •For an inferior good — such as generic store-brand food or used cars — rising income actually decreases demand, shifting the curve leftward as consumers switch to higher-quality alternatives.

Prices of Related Goods

  • •Substitute goods are products that can replace each other; when the price of coffee rises, demand for tea increases because consumers switch, shifting the tea demand curve right.
  • •Complementary goods are consumed together; when the price of printers rises sharply, demand for ink cartridges falls, shifting the ink demand curve left.

Consumer Tastes and Preferences

  • •A positive shift in consumer preference — driven by advertising, social trends, or news reports — raises demand for that product without any change in its price.
  • •Negative publicity or changing fashion can reduce demand, shifting the curve left.

Population Size and Demographics

  • •A larger population or an influx of buyers into a market increases the number of potential purchasers, raising overall demand.
  • •Demographic shifts — such as an aging population increasing demand for healthcare — can redirect demand across entire sectors.

Consumer Expectations About Future Prices

  • •If consumers expect prices to rise soon, many will buy now, increasing current demand and shifting the curve right.
  • •Expectations of a future price drop lead consumers to delay purchases, decreasing current demand.

About this Study Pack

Created by Kibin to help students review key concepts, prepare for exams, and study more effectively. This Study Pack was checked for accuracy and curriculum alignment using authoritative educational sources. See sources below.

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