Why would we want to tamp down demand? Things grow and demand more. We want to grow and expand not die off.
I dont think the 999 plan has legs. too expensive and intrusive. I want less governemtn not more.
999 abolishes the payroll tax. This would allow businesses to compete more on price and pass on savings to consumers.
So even with a national sales tax, the total cost of goods could (and likely would) be less.
This, coupled with increased household income generated by lower household income tax rates, would likely up, not tamp down, demand.