DW> Here in Canada, there's usually a sticker on the gas pump
 DW> that shows the breakdown of the price, with taxes etc.. I'm
 DW> not sure if these stickers are required by law.

In the US such stickers are absent because they are not required by law. 
These types of taxes are "hidden".  State sales taxes don't enjoy
this stealth, as the prices marked on items exclude the sales tax.  Such
exclusion is not required by law, but is a common practice by merchants for
obvious reasons.

If one prefers that the taxes be included in the price, then one condones
the practice of "hiding" taxes from the consumer.  According to
my reckoning, only a politician would favor this strategy.  I can't imagine
a consumer prefering this strategy as a matter of convenience.  What he is
doing, in effect, is making it convenient for the politicians to hide the
fact that he is being taxed.

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