It's quite evident that you don't have a very firm grasp on economics or business practices. Theoretical axioms in the class room are just that. They are a basis but do not reflect the challenges that occur in the real world. I don't have a business degree but have sold two companies and am working on my third.
Then by all means, help me out:
What considerations come into play when price-positioning consumer products?
If you do not know what you tax liability will be at the end of the fiscal year, nor how many widgets you'll sell, how can you cost it in the product?
Why in the **** burden your pricing model with guesstimated tax costs, at risk of diminished unit sales?
Ah fuckit, let me answer, pretending I have a little corner store: basically, I'm an idoit, but hope folks come in and buy stuff. If I was great business mind, I'd be pulling down the big bux working for a multi-national or sitting on the boards of corps. But I'm not, so I google (verb) it and find out that retail margin is 40% or so. Or I look at suggested retail, and take the reseller discount as my model for determining margin. Then I have an epiphany: $1.03 for candy bars is stupid. Make it 99 cents; I'll sell more.
Then, godwilling, I stay in business, and even have a nice profit (circa $80 grand or so). Then I think, I'm a genius, and ponder ways of getting more profit. God how I'd love to get it to $300 grand or even more. I could then brag about paying more tax than other make. Yippee for me!!!
(tip: taxes are what come after, if you're lucky)