I think that in a consumer-based economy that national sales taxes are more viable. I think that national sales taxes will do more to benefit and help an economy than something like income taxes. When people buy things, it is only logical to think that the economy is made to be stronger.
Sales taxes are more effective in helping the economy. Not everyone has a job, and some people may get income in other ways, but the money will be spent regardless and a sales tax ensures that everyone is taxed. They are also taxed at an equal rate. Having both a sales and income tax, however, is double taxing.
Sales taxes are more viable, but if we were to cut out income tax then sales taxes would have to be raised by quite a lot and there could not be exemptions on anything. I think this would be the easiest and most effective ways to drive up tax revenue.
A national sales tax is more viable in a consumer-based economy. We need to switch from having income taxes (which were never ratified by Congress), to a national sales tax. Everyone would get an allowance for certain necessities and then every item purchased would be subject to a sales tax. This would eliminate the loopholes of the rich, and would eliminate the non-payment of taxes of the poor.