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the most corrupt country in the world is Pakistan.
From 41 billionaires in 1987 to 425 billionaires in 2012, In 2004 there was 274 billionaires in the United States to find out the worlds total you would have to check each country for the year stated.
Billionaires (see related link).
The most expensive drop you can get on runescape is the corrupt dragon battleaxe at 3.9m
All corrupt weaponry and armour are dropped from players in pvp worlds.
Forbes reports that contrary to popular belief, it's not London or New York with most number of Billionaires, it's the Russian capital of Moscow. Find out more at : http://cafearjun.com/2008/11/05/moscow-has-the-worlds-greatest-number-of-billionaires-what/
yes
You can not corrupt it however you get Corrupted items as drops from PvP - Player Vs. Player worlds.
billionaires http://news.bbc.co.uk/1/hi/business/3710977.stm http://cafearjun.com/2008/11/05/moscow-has-the-worlds-greatest-number-of-billionaires-what/
Beijing
Since they are billionaires it would not surprise me. Also, since they are billionaires and run the worlds largest search engine they probably made it impossible to find out for sure.
London England has the most billionaires of any city in the world with about 72. Moscow is second and New York City is in third place.