Most coal is consumed in the country it is produced in, and there are large differences in prices, even in the same country.

FORBES: U.S. Crowned King of Coal, Some Disagree

However, because there is such a strong contrast in the preference for menthol by race and sex and because there are large differences in the rates of these cancers also by race and sex, we felt that this was a case in which an ecologic approach could be informative.

FORBES: Will Removing Menthol From Cigarettes Improve Health?

Yes there are still large differences but still, the aim for Facebook is obviously to leverage that dominance into a similarly commanding presence in the ad serving market.

FORBES: Both Google and Facebook Have Problems

There are a large number of regional and national differences in Europe, many of which should remain.

ECONOMIST: Responsible NATO

And after all, I think you have to recognise that throughout Europe - again it was a point made by Dominique De Villepin - there are differences between governments but by and large public opinion is pretty solid across Europe, and it is critical of any approach to this problem which doesn't involve going through the UN.

BBC: Breakfast with Frost

As you will see there can be large differences between what tax rates are on their income statements vs. what they pay in cash.

FORBES: Tech Companies: What Cash Taxes Do They Pay?