HM's right. I think the Indian shaving scene is the most staggering given the poverty on the large scale there, of course they largely use DE blades which are dirt cheap, and mostly see something like a 2 or 3 blade cartridge system as something they look forward to using one day when they're well off. 5 blade razors aren't really on their radar.
This worried Gillette massively seeing as their business model is to convert the world to 5 blades and more. Their answer was the Gillette Guard, (see link below and marvel at the simplicity)... one blade set in a bit of plastic. Reminiscent of a BIC orange, but with a permanent handle, and a bit cheaper. They sell it as being safer and better than a DE, and it's just that tiny bit dearer to attract the customers in. The plan is to get everyone started on carts of some description, then they're trapped in that escalating model.
Here's the guard, no expensive hard plastic tray for the carts, they just come in a little plastic bag.
http://www.ebay.co.uk/itm/ONE-GILETTE-GUARD-RAZOR-WITH-10-CARTRIDGES-REFILLS-/110827898674?pt=LH_DefaultDomain_0&hash=item19cddb8732
Russians still like DE blades hence the production scene there. It's about half and half though, younger professional guys like using carts, most common being the Gillette Atra / Slalom (I think it was what the Gillette GII was in the UK). Still reasonably cheapish... you'll notice on the Gillette multiblade model, Russia are where the UK was 20 years ago, India where we were 30-40 years ago.
http://www.ebay.co.uk/itm/GILLETTE-SLALOM-RAZOR-WITH-1-BLADE-SIMILAR-GILLETTE-ATRA-/200775268803?pt=LH_DefaultDomain_0&hash=item2ebf2379c3
Older and less well off Russian men use Russian made DE razors a lot because they cost a dollar or less for the razor... amongst current ones you've got Vostok, (cheap Tech copy) Schick (similar to a plastic Boots DE), Rapira butterfly razor (similar to a Gillette slim twist), then you have vintage (i.e. old) Russian razors which there are millions knocking about.
DE blades are ten a penny there, pretty much literally. This is why enterprising men like the eBay Atra seller above can make a healthy profit selling good quality Russian blades to decadent westerner. Ditto Bestshave and all the other overseas sellers... it's a good earner. Good luck to them.