It's a bit disappointing when "the world" and "USA" are used interchangeably. The US market is fairly small. Things are quite different in other places.
The USA is the world's largest consumer goods market, surpassing the next one, Japan, by a factor of 5. http://en.wikipedia.org/wiki/List_of_largest_consumer_market...
Germany, the UK, France, Italy, Spain, the Netherlands, Poland, Belgium, Greece, Sweden, Austria, Denmark, Portugal, Finland, Ireland and Romania combined – all EU member nations – are about equal to the US. They have a larger combined population (about 460 million v. about 310 million) but the USA certainly don’t beat them by a factor of 5 even taking population into account, more like a factor of 1.5.
Oh, and 10 divided by 2.8 is 3.6, not 5.