Pros/Cons of this tax system?

country had tax system

15% flat income tax plus 5% national sales tax (instead of different rates per state/region). no other state/city taxes besides fees permits, documents, parking tickets, etc.

of advantages , disadvantages system? tweak make better(in opinion?

say country had tax system 15% flat income tax plus 5% national sales tax (instead of different rates per state/region). no other state/city taxes besides fees permits, documents, parking tickets, etc. of advantages , disadvantages system? tweak to...

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