Productive & Allocative Efficiency (Cambridge (CIE) A Level Economics): Revision Note

Introduction to economic efficiency

• 'Economic efficiency' refers to the optimal use of scarce resources

• It involves producing the right goods at the lowest possible cost

• There are two main types: productive efficiency and allocative efficiency

1. Productive efficiency

• Occurs when firms produce at the lowest possible average cost

• This happens where MC = AC

• At this point, average costs are minimised

• There is no waste of scarce resources

• Productive efficiency occurs at the minimum point of the AC curve

• This is where MC intersects AC from below

2. Allocative efficiency

• Occurs when output reflects consumer preferences

• This happens where price = marginal cost (P = MC)

• At this point, social welfare is maximised

• There is no excess demand or excess supply

• Demand (AR) represents consumer willingness to pay

• MC represents cost of producing the last unit

• Allocative efficiency occurs where AR = MC

Summary Comparison

Global economic efficiency

• Global efficiency is reached when resources across countries are used in the best possible way

• This often involves international trade, where nations specialise in what they produce most efficiently

  • If Brazil focuses on exporting coffee while Germany specialises in engineering equipment, both countries benefit from trade

  • However, protectionist policies, such as tariffs or quotas, can disrupt this balance and reduce global efficiency by limiting access to cheaper or better-quality goods

Examples

• Lithium: As demand for electric vehicles grows, efficient extraction and recycling of lithium becomes essential to avoid shortages and environmental damage

• Freshwater: In regions facing drought, efficient irrigation systems and water-saving technologies help preserve this vital resource

• Digital bandwidth: With rising online activity, efficient use of data networks ensures smoother streaming, communication, and cloud services

• Trade agreements: Deals like the UK’s partnership with Australia aim to reduce barriers and improve the flow of goods, enhancing efficiency across borders