The answer, it seems, is 'however much they want, as long as you only get paid as though it cost 99c':
Sellers with a strong US base can expect a bonanza this Christmas season for sure.
But spare a thought for the rest of the world. Because the vast majority of your potential readers don’t live in the USA. And if you’re thinking, So what? Amazon is the world’s biggest book store and my book is available for 99c anywhere in the world, then think again.