Kid, a "supply-side" tax cut would have two components, a first components directed to the lower and middle class and a second "supply-side" component directed to the wealthy whose tax rates are lowered. Surely the first components of any such tax cut would result in an immediate and sustained increase in private spending. The second component, as you say, will be partially if not completely absorbed in buying new treasury notes to finance the short-term deficit. As there is excess capacity in the system typically when taxes are cut, increased spending by the lower and middle class will lead to higher production without inflation. This should increase tax revenue to partially offset the need to sell treasuries. Because inflation is not rising, interest rates will remain constant even though there is a significant increase the supply of treasury notes.
Not all the new treasuries will be purchased by Americans. A great deal will be purchased by foreigners. This would allowing a significant portion of the tax decrease to be spent by the rich on new luxury items including new homes, etc. etc. etc., and new investments, also helping the economy.
But the most important aspect of tax rate cuts to the rich is the behavior modification the lower rates adduce. The rich will be less inclined to place their money in low return investments such as treasury notes and more inclined to put their money into high return (but risky) business investments, thus helping to create new jobs and new wealth the country.
Not all the new treasuries will be purchased by Americans. A great deal will be purchased by foreigners. This would allowing a significant portion of the tax decrease to be spent by the rich on new luxury items including new homes, etc. etc. etc., and new investments, also helping the economy.
But the most important aspect of tax rate cuts to the rich is the behavior modification the lower rates adduce. The rich will be less inclined to place their money in low return investments such as treasury notes and more inclined to put their money into high return (but risky) business investments, thus helping to create new jobs and new wealth the country.
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