When I become President of the United States things will be different.
The reason we do not use 2 dollar bills is because there is not room for them in the standard cash register.
Since every thing cost more than a dollar ,when you add the tax, I would do away with the dollar bill and start currency with 2 dollar bills. In the rare case that something is "a buck" you'd have to use 4 quarters.
I remember a story a while back where this old black guy got arrested or something and he had a very high denomination bill in his wallet and when he got it back they had took it and exchanged it for the same amount of money but small denominations.