Economics Pad

Supply / Demand Model

Move the sliders for the non-price determinants of demand and supply to shift the curves, click and drag either curve, or grab points A and B to change a curve's slope. Previous positions are kept as faded shadows.

Set your starting position

Move at least one Demand control (slider, drag, or drag point A/B) and one Supply control. Once both have been touched, the original equilibrium is marked as (Q, P) and subsequent moves leave labelled shadows.
○ Demand moved ○ Supply moved
S D Quantity Price
Scenarios

Price Elasticity of Demand (PED)

Drag the blue A and B points on the Demand line to change its slope and recompute PED between them.
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Factors influencing PED

Move the sliders below to see how each determinant affects the steepness of the demand curve. A steeper curve = more inelastic demand.

Applications of PED

  • Pricing strategy: If demand is inelastic, firms can raise prices to increase revenue. If elastic, cutting prices increases revenue.
  • Taxation: Governments tax goods with inelastic demand (tobacco, alcohol, fuel) to raise revenue without large falls in consumption.
  • Consumer behaviour: Understanding PED helps predict how strongly consumers will react to a price change — essential for market analysis.
  • Example: Airlines charge higher prices during peak seasons knowing demand is inelastic (few alternatives, last-minute travel).

Price Elasticity of Supply (PES)

Drag the red A and B points on the Supply line to change its slope and recompute PES between them.
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Factors influencing PES

Move the sliders below to see how each determinant affects the steepness of the supply curve. A steeper curve = more inelastic supply.

Applications of PES

  • Market prices: Inelastic supply means price rises cause large revenue gains for producers but output barely changes — common in agriculture and energy.
  • Government subsidies: Subsidies lower production costs, shifting supply right and making it more elastic over time — used in renewable energy policy.
  • Business planning: Firms with elastic supply can respond to booms quickly. Those with inelastic supply risk losing market share during demand surges.
  • Example: Wheat supply is inelastic in the short run (fixed by planting cycles); manufactured goods like smartphones are more elastic as factories can scale.

Supply

non-price determinants of supply

Demand

non-price determinants of demand

Feedback

If you used this in a lesson or for studying, please let me know how you used it so I can work on improvements.

Open feedback form →

AD / AS Model — Full version

Move the sliders for the components of AD and the factors of production for AS to shift the curves. The previous positions are kept as faded grey shadows so you can compare.

Set your starting position

Move at least one AD slider and one AS slider to set where the model begins. Once both have been moved, the original equilibrium will be marked as (Y, P) and subsequent moves will leave labelled shadows.
○ AD moved ○ AS moved
AS AD Real GDP Price Level SPARE CAPACITY INTERMEDIATE FULL CAPACITY
Scenarios

Aggregate Supply

factors of production

Aggregate Demand

AD = C + I + G + (X − M)

Feedback

If you used this in a lesson or for studying, please let me know how you used it so I can work on improvements.

Open feedback form →
Curves
Curve 1
Curve 2
Shape
Curve Label & Colour
Axis & Equilibrium Labels
Intersections

Click chart to place. Hover over a dot and click × to remove it.

History & Ghosts

Position curves freely, then click Set to start recording ghost shadows.

Export

Standalone interactive HTML file.

Drag A or B to reposition curve endpoints · Drag the curve body to move both · Click label to rename

[This page is a mock-up for ideas for the future.]

Resources

Lesson handouts, worksheets and reference material for the topics covered by the interactive model could be available here. (Mock-up — I would replace the placeholders below with my own Drive links, PDFs and embeds.)

Lesson handout

An example of a Google Doc could be embedded directly in the page here. Edits made in Drive would then appear here automatically — nothing to re-upload.

Embedded Google Doc would appear here.

Worksheets & printables

Direct links to PDFs hosted on Google Drive. Set each file’s sharing to “Anyone with the link can view”. [Links below are examples.]

Video walkthroughs

YouTube embeds — I could copy the “Embed” iframe code from any video’s Share menu.

Embedded YouTube video would appear here.

External reading