None of the sales tax proposals are "retail sales tax". The national sales tax proposals are a tax " of the gross payment" (including itself) and NOTHING is exempt. A 23% "sales tax" would increase prices by 30% ....That means rent, leases (including vehicle leases) haircuts, lawyers fees, insurance, government services, public utilities, tolls, lawn maintenance, even (beleive it or not) interest paid and interest earned is taxed as well as taxes and fees imposed/included in the gross payment...There's a tax on gambling and the REAL bugaboo is a tax ON the "wages, salaries and benefits of "ANY" (local, state, federal) government employees....
You may think it will "encourage investment" but the "revenue neutral" sales tax proposals would leave little disposable income for investing. Your earnings would be nothing more than taxes yet to pay.