Fiscal Policy Multiplier Activity

Use this 35 minutes classroom activity to teach fiscal policy multipliers through one concrete decision. Students generate the multiplier chain and explain why the tax multiplier is smaller in absolute value. Students create the economic outcome themselves before naming the model. Resist explaining the result during the first round. The debrief is where the experience becomes economics.

The classroom prompt

Government purchases rise by $100. Each recipient spends 75 percent of new income. Teams pass the spending through five rounds, estimate the remaining tail, and compare the result with a $100 tax cut.

Put the question where every student can see it and do not supply vocabulary before students commit to an answer. Their first explanation becomes the evidence you use during the debrief.

Materials and setup

Give teams a $100 initial-spending card and set MPC at 0.75. Provide round cards and calculators.

Open the spending multiplier calculator if you want students to test the same idea on an interactive model after the paper task. A projected version is enough; students do not need accounts for this lesson.

Run the lesson

Answer key and teacher moves

• With MPC 0.75, the spending multiplier is 1/(1 - 0.75) = 4, so the simple-model change is $400.
• The tax multiplier is -0.75/(1 - 0.75) = -3.
• A $100 tax cut raises GDP by $300 in the simple model because $25 leaks before the first spending round.
• Equal $100 increases in G and T change GDP by $400 - $300 = $100, so the balanced-budget multiplier is 1.

Do not give credit for the correct direction alone. Ask students to name the changed determinant, identify the curve or quantity that changes, and connect the change to the final outcome. A complete explanation contains a cause, a model move, and a result.

What to collect

Collect the round table, both multiplier formulas, and a sentence explaining the first-round difference.

Most likely misconception: Students use the spending multiplier for a tax change without multiplying the first round by MPC.

Support and extension: Provide the first two rounds. Extend by adding MPM 0.10 and MPT 0.15 so the multiplier becomes 1/(MPS + MPM + MPT).

A clean closing question

End with: What changed, what stayed fixed, and what evidence proves your conclusion? That sentence works as the final written check because it forces students to separate a cause from the movement it produces. Collect it, scan for the misconception above, and use the first three minutes of the next class to repair the pattern if needed.

This resource is ready to copy into a slide, handout, or LMS assignment. If you assign it for points, publish the success criteria before students begin: correct model, correct direction, and an explanation that links the two.