The World's Wealth Cartogram

From http://www-personal.umich.edu/~mejn/cartograms/

This is a cartogram of the world in which the sizes of countries are proportional to Gross Domestic Product, which is a measure of how much wealth a country's economy generates, and hence, to an extent, of the wealth of the country's inhabitants.

Which countries have the largest part of the world's wealth?

Which continent seem to almost disappear on this cartogram?