The Rahn curve is a graph used to illustrate an economic theory, proposed in 1996 by American economist Richard W. Rahn, which suggests that there is a level of government spending that maximizes economic growth. The theory is used by classical liberals to argue for a decrease in overall government spending and taxation. The inverted-U-shaped curve suggests that the optimal level of government spending is 15–25% of GDP.^[1][2]

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• Government spending
• Laffer curve
• Tax cut