[takluyver]

According to Wikipedia, Amazon has national sites covering North America, most of Europe, Brazil, Japan & China. That's a pretty substantial slice of the world's population.

[zurn]

Only a handful of European countries: Germany, UK, France, Italy I think. That's 15.2% of Europe by area.

[takluyver]

But probably rather more by population. Also, I'd guess that at least some of the other countries get reasonably cheap shipping from those sites.