Let's do brown townysis.
Let's say this happened: Higher class taxes are lowered, lower class taxes are raised.
Yes, the lower class will give more of their money to the government.
Higher class now has more of their well deserved money, can make more factories (or whatever they're selling/manufacturing),
This makes more jobs.
More jobs == Less unemployment.
Less unemployment == More spending.
More spending == Companies with more money
Companies with more money == Higher wages.
Higher wages == More spending.
More spending == Better economy.
Better economy == Less debt.
Less debt == More people with money.
More people with money == More spending.
More spending == better economy.
And so on, and so forth.
Lets do another.
Let's say this happened: Lower class taxes are lowered, Higher class taxes are raised.
The higher class, who own large corporations, would have to lay off workers, or have them earn less. They may have to close their factories (or store or whatever), which will cause mass lay-offs, just to cope with this.
Less money == More unemployment.
More unemployment == Less money to companies.
Less money to companies == Lower, lower wages.
And then everyone's out of a job and on welfare.