EDIT - (can't edit now). "Impossible" to have one single price that is applicable to every single potential buyer in all cases. Easiest example: if a computer

EDIT - (can't edit now). "Impossible" to have one single price that is applicable to every single potential buyer in all cases. Easiest example: if a computer is advertised as $2199 "including all taxes!" and a buyer who is tax exempt is buying... they wouldn't pay the $2199 advertised price (or... shouldn't).