Well, Tijana, you are in for a treat. Here is the introductory paragraph of The Progressive Income Tax: Theoretical Foundations:

The Progressive Income Tax has an impact on the welfare of an economy's participants that few people understand. This is because most economists have overlooked the impact that an across-the-board change in disposable incomes will always have on market prices. In this article, we review the merits of the Progressive Income Tax from an analytical perspective that fully incorporates the impact of this crucially important variable.

Our analysis leads to some conclusions that many will perhaps find stunning:

---Even a steeply progressive income tax---right up to 99% on the highest incomes---would impose no loss of purchasing power on wealthy income earners

---Reducing the income tax rates of rich citizens will weaken the economy if Congress cuts spending to pay for the tax cuts

---Increasing the amount of taxes collected from wealthy citizens will actually provide a stimulus to the economy

---The rich cannot get richer---in real terms---by getting their taxes cut, but they can become richer if they pay more in taxes

---The government is a major producer of Real Wealth

---An increase in the size of government is almost always quite desirable

---Wealthy citizens who are wise should be lobbying for an increase in government spending and an increase in their tax rates

Cornell's Dr. Robert H. Frank [Microeconomics & Behavior 1991, The Winner-Take-All Society (1995), Luxury Fever (1999), Principles of Economics (2001)] had this to say after reading The Progressive Income Tax: Theoretical Foundations:

"...you can put me on record as saying that your arguments on tax policy are among the best that I've seen..."

Perhaps a read worth your time?