Price Elasticity of Supply measures how responsive the quantity supplied of a product is to a change in its price.
It answers an important agricultural question:
If a crop or livestock price changes, how much can and will producers change the quantity they supply?
The Law of Supply tells us the expected direction of producer response. Price Elasticity of Supply tells us the size of that response.
What Is Price Elasticity of Supply?
Suppose tomato prices rise by 10 percent.
If farmers increase quantity supplied by 20 percent, Supply is relatively responsive.
If quantity supplied increases by only 3 percent, Supply is much less responsive.
Price Elasticity of Supply, abbreviated as PES, measures this difference.
What Is the Formula?
The standard formula is:
Price Elasticity of Supply = Percentage Change in Quantity Supplied ÷ Percentage Change in Price
Suppose crop prices increase by 10 percent while quantity supplied increases by 15 percent.
PES = 15% ÷ 10% = 1.5
Supply is elastic.
What Is Elastic Supply?
Supply is generally considered elastic when PES is greater than 1.
The percentage change in quantity supplied is larger than the percentage change in price.
Producers are relatively responsive to market incentives.
What Is Inelastic Supply?
Supply is inelastic when PES is less than 1.
Quantity supplied changes proportionally less than price.
Agricultural Supply is often relatively inelastic in the short run because farming depends on biological cycles and physical resources.
A maize farmer cannot produce a mature harvest tomorrow merely because maize prices rise today.
What Determines Agricultural Supply Elasticity?
Several factors are particularly important.
Time
Farmers may have limited ability to change output immediately but greater flexibility over several production cycles.
Biological production periods
Livestock and crops require time to mature.
A poultry producer can usually adjust output more rapidly than a cattle producer because production cycles differ.
Availability of resources
Farmers may respond more strongly if additional land, labour, seed, machinery and finance are readily available.
Storage
Stored commodities can sometimes be released when prices rise, making market Supply more responsive.
Production flexibility
Farmers who can switch land and other inputs among different commodities may respond more rapidly to changing prices.
Short-Run vs Long-Run Supply
Supply elasticity can differ substantially over time.
Consider coffee production.
A farmer cannot create mature coffee trees immediately after prices rise.
Short-run Supply may therefore respond very little.
Over several years, farmers can plant additional trees, invest in technology or expand acreage.
Long-run Supply may consequently be more elastic.
Why Is Price Elasticity of Supply Important?
Supply elasticity helps explain why agricultural prices can be volatile.
If Supply is highly inelastic and Demand increases sharply, prices may rise substantially because producers cannot quickly increase output.
If Supply is more elastic, production can respond more strongly and price pressure may be smaller.
The concept is therefore important for Agricultural Risk, production planning, market forecasting and policy analysis.
Agricultural Supply Elasticity and Risk
Farmers often make production decisions months before harvest.
Prices may change during this period.
The delay between production decisions and market outcomes contributes to Price Risk and Agricultural Risk.
Understanding Supply responsiveness can help farmers and Agribusinesses plan more effectively.
Key Takeaways
- Price Elasticity of Supply measures how strongly quantity supplied responds to price changes.
- Its formula divides percentage change in quantity supplied by percentage change in price.
- Supply is elastic when PES is greater than 1.
- Supply is inelastic when PES is less than 1.
- The Law of Supply gives the direction of response; elasticity measures the strength.
- Time is especially important in agriculture.
- Biological production cycles can make short-run Supply relatively inelastic.
- Land, inputs, storage and production flexibility also influence Supply responsiveness.
- Long-run agricultural Supply may be more elastic than short-run Supply.
- Supply elasticity helps explain agricultural Price Volatility and production response.
Continue Exploring
Supply — Understand the broader Supply relationship.
Law of Supply — Learn how producers generally respond to price changes.
Supply Curve — Explore Supply graphically.
Price Elasticity of Demand — Compare consumer responsiveness.
Agricultural Productivity — Understand efficiency in agricultural production.
Price Volatility — Explore changes in agricultural prices.
Agricultural Risk — Understand uncertainty in farming.
References and Further Reading
- Massachusetts Institute of Technology. Principles of Microeconomics — Elasticity.
MIT Elasticity - OpenStax. Elasticity. Provides the standard framework for interpreting Supply elasticity.
OpenStax — Elasticity - OECD & FAO. OECD-FAO Agricultural Outlook 2026–2035.
OECD-FAO Agricultural Outlook 2026–2035 - OECD & FAO. OECD-FAO Agricultural Outlook — Key Messages.
OECD-FAO Outlook — Key Messages - USDA Economic Research Service. Commodity Costs and Returns.
USDA Commodity Costs and Returns - Food and Agriculture Organization of the United Nations. Agrifood Economics.
FAO Agrifood Economics