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Macro by Mark

Global Economic Data, Empirical Models, and Macro Theory
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Public data from government agencies and multilateral statistical releases, anchored in official sources

© 2026 Mark Jayson Nation

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Theory-Based Models

Loading Theory-Based Models

Macro by Mark

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Keynesian Cross
Model

The 45-degree line model where planned expenditure E = C + I + G intersects the identity line Y = E to determine short-run equilibrium output. The gap between spending and income drives inventory adjustment until the two converge.

Compare

This model uses static comparative statics -- no genuine time axis exists.

Shock presets

Fiscal expansion

Government raises purchases, shifting the expenditure line upward.

Higher MPC

Consumers spend a larger share of additional income, steepening the expenditure line and raising the multiplier.

Investment collapse

Animal spirits sour and planned investment falls, shifting the expenditure line downward.

Controls

Diagram, readouts, and summary update with each change.

Expenditure

Policy

Impact summary

Current equilibrium

Equilibrium output

600.0

Multiplier

4.00

Autonomous expenditure

150.0

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