economic price elasticity demand and supply

. Price Elasticity of Demand (PED)

PED measures the responsiveness of the quantity demanded of a good to a change in its price.

The Formula

PED=% change in quantity demanded% change in pricePED = \frac{\% \text{ change in quantity demanded}}{\% \text{ change in price}}

Key Values and Interpretations

  • Price Elastic ($PED > 1$): Consumers are very sensitive to price changes. A small increase in price leads to a large drop in quantity demanded (e.g., luxury goods like jewelry).

  • Price Inelastic ($0 < PED < 1$): Consumers are not very responsive. A change in price results in a smaller percentage change in quantity demanded (e.g., necessities like bread or addictive goods like cigarettes).

  • Unitary Elastic ($PED = 1$): The percentage change in quantity is exactly equal to the percentage change in price.

Determinants of PED

  1. Availability of Substitutes: More substitutes make demand more elastic.

  2. Degree of Necessity: Necessities are inelastic; luxuries are elastic.

  3. Proportion of Income Spent: Cheap items (salt, matches) tend to be inelastic.

  4. Time Period: Demand becomes more elastic over time as consumers find alternatives.

2. Price Elasticity of Supply (PES)

PES measures the responsiveness of the quantity supplied of a good to a change in its price.

The Formula

PES=% change in quantity supplied% change in pricePES = \frac{\% \text{ change in quantity supplied}}{\% \text{ change in price}}

Key Values and Interpretations

  • Price Elastic ($PES > 1$): Firms can easily increase production if prices rise (e.g., manufactured goods with spare capacity).

  • Price Inelastic ($0 < PES < 1$): Firms find it difficult to change production levels quickly (e.g., agricultural crops that take time to grow).

Determinants of PES

  1. Time Period: Supply is inelastic in the short run but more elastic in the long run.

  2. Availability of Stocks: High stock levels make supply more elastic.

  3. Spare Capacity: If a factory isn't running at 100%, it can quickly increase supply (elastic).

  4. Mobility of Factors of Production: If workers and machines can easily switch tasks, supply is more elastic.

3. Importance for Decision Makers

  • For Businesses: Understanding PED helps in setting prices to maximize Total Revenue. If demand is inelastic, increasing prices will increase revenue. If demand is elastic, lowering prices will increase revenue.

  • For Governments: Governments often tax goods with inelastic demand (like alcohol or petrol) because the quantity demanded won't fall significantly, ensuring high tax revenue.

While I cannot create graphical content directly, here's a description of how you can draw a graph illustrating Price Elasticity of Demand (PED) and Price Elasticity of Supply (PES):

Axes:

  • X-axis: Represents the quantity demanded or supplied.

  • Y-axis: Represents the price.

Drawing the Graph:

  1. Price Elasticity of Demand (PED):
       - Draw a downward sloping curve from left to right to signify that as price decreases, quantity demanded increases.
       - For inelastic demand, indicate with a steeper curve, showing less responsiveness to price changes.
       - For elastic demand, illustrate with a flatter curve, demonstrating significant responsiveness to price changes.

  2. Price Elasticity of Supply (PES):
       - Draw an upward sloping curve from left to right to show that as price increases, quantity supplied also increases.
       - For inelastic supply, use a steeper curve indicating that firms struggle to adapt to price changes quickly.
       - For elastic supply, depict with a flatter curve showing that firms can easily increase production as prices rise.

Key Points to Highlight on the Graph:

  • Mark regions for elastic demand (PED > 1) and inelastic demand (PED < 1).

  • Mark regions for elastic supply (PES > 1) and inelastic supply (PES < 1).

You can use graphing software or hand-draw this based on the description provided.