Are you including the share of SS that the employer contributes out of sight of the employee? So, an employees wage would be something like (net pay + tax = gross pay + employee matching (ss+tax match) = total wage)?I think (I could be wrong) most economists include the employer portion of the payroll tax in nominal wages because it is part of the "wage bargain" (I am going to pay you X for Y output). I believe they also include other benefits like insurance.
If so, I might better understand your wage decrease statement. If not, clearly I'm still confused.
I don't have any data to argue with this post, nor do I have any motivation to argue with it. What I read (hear) you saying is that the after tax price is constant and real wages are constant (spending power). That leads me to believe that you're saying the net effect to the individual is that there is no change as a result of the method of revenue collection.
Assuming that is correct, I still would support the NRST over the current income tax system. Why wouldn't we want to bring the cost of government into the plain view of the citizens being governed? In my opinion, that would be the single biggest step towards spending reductions that could be taken.