Topics: Microeconomics | Government Intervention | Equity
Level: JC H2 Economics / IB Economics
An Agricultural Price Floor is a minimum price set by the government above the free market equilibrium price (Pe) for agricultural products.
The Objectives:
Increase Farmers’ Incomes: To alleviate poverty, as farmers are often lower-income earners (Promoting Equity).
Stabilize Incomes: Agricultural prices are notoriously volatile due to weather shocks and inelastic demand/supply. A price floor provides certainty.
Watch the video explanation with the accompanying notes below:
1. How it Works: The Mechanism
When the government sets a minimum price (Pmin) above the equilibrium (Pe):
Quantity Supplied: Increases, as farmers are incentivized by the higher price.
Quantity Demanded: Decreases, as consumers buy less at the higher price.
The Result: A Surplus (Excess Supply) of Qs – Qd).
2. The Unique Feature: Buying the Surplus
Unlike a Minimum Wage or a Price Floor on Alcohol (e.g., in Scotland), an Agricultural Price Floor is almost always accompanied by a Government Guaranteed Purchase.
Why must the government buy the surplus?
To Protect Revenue: If demand for the specific crop (e.g., Taiwan Cabbages) is Price Elastic (PED > 1), a higher price causes a massive drop in quantity demanded. Without the government buying the excess, farmers’ total revenue might actually fall.
To Prevent Price Collapse: If the government doesn’t buy the surplus, farmers are left with rotting crops. They might illegally sell them at lower prices (“Black Market”), causing the price floor to disintegrate.
By buying the surplus, the government effectively shifts the Demand curve to the right to match the surplus supply.
3. Problems & Limitations
While well-intentioned, this policy comes with significant economic costs.
Strain on Government Budget: Buying, storing, and transporting the surplus costs money. This incurs an Opportunity Cost—funds could have been used for healthcare or education.
Allocative Inefficiency: Resources are over-allocated to the production of this crop (producing Qs instead of the socially optimal Qe. This creates Deadweight Welfare Loss to Society.
Wastage of Resources: What does the government do with the surplus?
Destroy it? Pure waste of scarce resources.
Sell it overseas (“Dumping”)? This harms farmers in other countries by depressing global prices.
Productive Inefficiency: With a guaranteed high price (Pmin), farmers may become complacent. There is less pressure to adopt cost-cutting technologies or be efficient.
4. Real-World Case Study: Taiwan Cabbages
In Taiwan, the government implemented a price floor for cabbages with a guaranteed purchase scheme.
The Evaluation (The Silver Lining):
While there were costs, there was also a Dynamic Efficiency benefit.
With higher and more stable incomes, farmers felt secure enough to innovate.
They experimented with new cabbage varieties.
Result: Consumers eventually enjoyed a wider variety of better-quality cabbages.
Exam Tip: When evaluating Price Floors, do not just list the downsides (Surplus/Inefficiency). Use the Taiwan Case Study to show that if stability encourages innovation, society can still benefit in the long run.
(For more details on types of Government Interventions check out our dedicated Government Intervention Notes. For other topics, browse our full Economics Notes Library.)