Interactive economics exercise

Supply & Demand Lab

Shift either curve, compare the old and new equilibria, and follow the four-step explanation. Explore prices away from equilibrium to see the difference between a curve shift and a movement along a curve.

One-file classroom tool

Market diagram

Illustrative price and quantity indices, both from 0 to 100

Updates live

current supply current demand original curve, when shifted equilibrium

Equilibrium price50Original 50 · unchanged

Equilibrium quantity50Original 50 · unchanged

Change the market

Try a pictured example or set your own shifts. Right means more supplied or demanded at every price.

Supply shiftNo shift

Left · less supplyNo shiftRight · more supply

Demand shiftNo shift

Left · less demandNo shiftRight · more demand

Explore a non-equilibrium priceSee quantity demanded, quantity supplied, and the resulting pressure on price.

Four-step approach

Starting equilibrium

Base case

Define the market

Identify the change

Shift the curves

Compare equilibria

Movement versus shift

Worked explanation