Supply Shift Right (Increase in Supply)
Diagram showing a rightward shift of the supply curve, leading to lower equilibrium price and higher quantity. Used to analyse cost reductions, technology improvements, or subsidies.
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A rightward shift in supply shows that producers are willing and able to supply more goods at every price level than before. This occurs when non-price factors make production easier, cheaper, or more profitable. The shift results in a new equilibrium with lower prices and higher quantities traded. This diagram is fundamental for understanding how market conditions affect supply and market outcomes.
Key points
- A rightward supply shift means increased supply - more quantity supplied at every price level
- Caused by non-price factors: lower production costs, improved technology, government subsidies, or more suppliers entering the market
- Results in a new equilibrium with lower equilibrium price and higher equilibrium quantity
- The entire supply curve moves to the right, not just movement along the existing curve
- Consumers benefit from lower prices while producers benefit from selling larger quantities
Exam tip
Always distinguish between movements along the supply curve (caused by price changes) and shifts of the entire supply curve (caused by non-price factors). Examiners are impressed when students explicitly state that the rightward shift represents an increase in quantity supplied at every price level, not just at one price point.
Common mistakes
Students often confuse shifts in supply with movements along the supply curve, incorrectly stating that price changes cause supply shifts. Another frequent error is forgetting to explain that the shift affects quantity supplied at all price levels, not just at the original equilibrium price.
Exam board notes
All major exam boards treat this diagram identically, requiring students to understand the causes of supply shifts and their effects on market equilibrium. The core concepts and expected analysis remain consistent across AQA, Edexcel, OCR, and CIE specifications.
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