I kind of like the idea of a national sales tax in place of our current income tax. That way people would all pay for what they use, as opposed to being charged by the government more for being more successful at earning money. I understand that there are people who don't like the idea. I've heard it posited that a sales tax (or a "fair tax") would disproportionately tax lower income families because they would spend a greater percentage of their income on taxes.
Retail shoppers in England have found a similar situation, though not quite tit-for-tat. The nation's second largest food retail chain has busted to the pressure and stopped charging more for larger size bras. This Yahoo news article kept us abreast of the situation. It now appears that A cups and F cups can be bosom buddies when shopping.
How is this similar to the fair tax? Well, women who buy larger bras buy more fabric, which increases the cost of manufacture. Women who buy smaller bras buy less fabric, which would cost less to manufacture. Now, women who buy smaller bras are spending more proportionately than their more endowed sisters, meaning a higher percentage of their endowment will go to line the bra manufacturer's and the department store's coffers. But, the increased sales anticipated from the larger bras will surely prevent any cleavage into the profit margins.