Market Equilibrium Lab
Supply, demand, tax. This multi-solver chains 3 solvers into a single guided workflow — run each step in order and carry the result forward.
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Presets
Where the downward demand curve crosses the upward supply curve, the market clears: that price and quantity are the equilibrium. Shifting either curve moves it. The shaded triangles are consumer and producer surplus — the total gains from trade. A per-unit tax lifts the supply curve, raising price, cutting quantity, and creating deadweight loss.
Data Inspector
Governing equation
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
Controls
Presets
Elasticity measures how much quantity demanded responds to price. Where demand is elastic (|E| > 1), a price cut raises total revenue; where it is inelastic, a price cut lowers revenue. On a straight-line demand curve the top half is elastic, the bottom half inelastic, and revenue peaks exactly at the midpoint where elasticity equals one.
Data Inspector
Governing equation
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
Controls
Presets
At a 0% tax rate the government collects nothing; at 100% no one bothers to earn taxable income, so it also collects nothing. Somewhere between lies a revenue-maximizing rate — the peak of the Laffer curve. How responsive people are to taxes (the elasticity) sets where that peak falls. It is descriptive, not a policy prescription.
Data Inspector
Governing equation
Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.
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Frequently asked questions
- What is the Market Equilibrium Lab multi-solver?
- Market Equilibrium Lab is a guided workflow that chains 3 individual PolySim solvers into one end-to-end analysis, piping each result into the next step.
- Is it free to use?
- Yes. Every step runs entirely in your browser using real numerics — no install, no account, no cloud cost. Custom or private solver packs are available as a paid service.