Illustrative parameters — not real-market estimates
Model controls
Qd = a − bP · Qs = c + dP · equilibrium occurs where Qd = Qs.
Demand shift / Supply shift
Demand point elasticity / Supply point elasticity
More inelasticMore elastic
More inelasticMore elastic
Selected market price80
Above equilibrium, quantity supplied exceeds quantity demanded and the model shows a surplus. Below equilibrium, the difference is a shortage.
Model assumption
Supply, demand, and equilibrium
Price is vertical; quantity is horizontal. E₀ is the starting model and E₁ is the current scenario.
Equilibrium price80
Equilibrium quantity84
At equilibrium0
Before / After
What changed
Before70
After80
+14.3%Before76
After84
+10.5%Methodology & sources
A visible, solvable model of a market.
This teaching model uses linear curves. The equations are transparent, while every starting coefficient and preset is illustrative rather than empirical.
Demand / Supply
Qd = a − bP · Qs = c + dP · equilibrium occurs where Qd = Qs.
Demand shift / Supply shift
A shift changes a curve's intercept. The user chooses its size; causes such as income, preferences, input costs, technology, taxes, or expectations do not imply a fixed percentage response.
Surplus / Shortage
Above equilibrium, quantity supplied exceeds quantity demanded and the model shows a surplus. Below equilibrium, the difference is a shortage.
Demand point elasticity / Supply point elasticity
The controls change linear slope parameters. The displayed classification is calculated as point elasticity at the current equilibrium, not assigned as a benchmark.
Academic source
Principles of Economics 3eSteven A. Greenlaw, David Shapiro, Daniel MacDonald · OpenStax · 14.12.2022
Used for the supply-demand framework, equilibrium, surplus and shortage, shifts, and elasticity definitions.
View sourcePrice Elasticity of Demand and Price Elasticity of SupplyOpenStax · Principles of Economics 3e · Chapter 5.1
The controls change linear slope parameters. The displayed classification is calculated as point elasticity at the current equilibrium, not assigned as a benchmark.
View sourceIllustrative parameters — not real-market estimates
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