With various people complaining about "price gouging”... economist Walter Williams has coined a new term: "Tax gouging." But government is never accused of either "greed" or "gouging" — not even when they bulldoze people's homes in order to turn the land over to businesses that will pay more taxes.
Any tax over 12-14% -- regardless of the base -- will corrupt enough taxpayers to render the system unfair to all. So, beware of single-tax proposals. The U.S. government blows more money than any single tax can generate. The key is to tax multiple bases, disparate in nature, and with simple flat rates. That is a system both fair and sustatinable.