What is the market capitalization of the US Stock market versus the rest of the world?

According to p. 100 of "The Bogleheads' Guide to Investing" (published in 2007), US stocks represent about one half the value of world stocks.

According to Wilshire Associates, the total U.S. market cap is approximately $15.35 trillion (May 23, 2007).

According to the World Federation of Exchanges, global market cap stood at 51.23 trillion in January 2007.

So the rest-of-world market cap is at least twice as large as the U.S. Stock Market.