Comment by PMunch

I guess "necessary" was a bit too vague of a word. I meant that for all your various requirements such as quality, style, workers conditions, etc. there is a cost included. If I gave you the same shirt, from the same brand, created by the same people, but gave you two options for price you'd choose the lower one. If I gave you one shirt at a high price and one shirt at a low price you'd need the higher priced shirt to be justifiably more expensive.