The National Sales Tax is the fairest tax, and the simplest. If you’re feasting on lobster, you’re paying more tax than the guy buying Top Ramen; if you’re buying a Tesla, you’re paying more tax than the guy picking up a cheap used Camry.
It’s also a great way to keep the government in line and working for the people. If people are buying, the government is collecting. If the economy is in the dumpster, well, sorry. You’ll just have to do better, government.