# How to Use (and Make) EconGraphs

Chris Makler
Stanford University

econgraphs.org

JET SET 2022

## Outline

• Motivation
• How to create your own!

## Motivation

• 10 years in ed tech industry
• Found that interactive graphs are incredibly effective teaching tools
• Decided to make my own as a public good
• Have been using in my own classes since 2015

## Uses of Interactives

• Classroom demonstrations
• Student exploration
• In textbook explanations
• Assessment questions

LONG-TERM PLAN

P
p(q)
Q

The total revenue is the price times quantity (area of the rectangle)

## Classroom Demonstration: Marginal Revenue

P
p(q)
Q
\Delta P
\Delta Q

The total revenue is the price times quantity (area of the rectangle)

If the firm wants to sell $$\Delta Q$$ more units, it needs to drop its price by $$\Delta P$$

Revenue loss from
lower price on existing sales

\text{marginal revenue} = \Delta P \times Q + \Delta Q \times P

• KineticGraphs.org
• Desmos.com

Feedback: cmakler@stanford.edu