The economic theory that adopts the idea that cutting the marginal tax rate can actually increase government revenue is supply-side economics.
Supply-side economics, can as well be described as the trickle-down economics, theory which is one that focuses on influencing the supply of labour and goods.
It should be noted that this is usually done by the use of tax cuts and benefit cuts as incentives to work and produce goods., however it can be perceived as one that focus on the process of cutting the marginal tax rate which can actually increase government revenue.
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