One part of the supply-side economics argument is that

Question

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Supply-side economists argue that lowering marginal tax rates can incentivize individuals and businesses to work harder and invest more, ultimately leading to increased economic growth and higher tax revenues overall. While the idea that the relevant aggregate supply curve is close to horizontal is associated with supply-side economics, it is not directly related to the argument about tax rates. The choice of a 50 percent marginal tax rate is not a central tenet of the theory, but rather a specific policy recommendation that some supply-siders may support.

One Part of the Supply-Side Economics Argument Is That