Why the obsession with taxing? The purpose of an economy is to create goods and services, and not just any goods and services, but the ones people want and can afford. The sales tax would apply at every level of production, just making everything more expensive. This thread was created with wages in mind. If you want REAL wages to go up (not just nominal wages), and you want the stuff to cost less through greater supply, do tax industry. Also, a maximum wage will halt investment at a certain point, slowing production even more.
In other words, the purpose for higher wages is to afford more things. Taxing production will go counter to that goal. Also, the money is just funneled to the most wasteful institutions possible.