Asian investors have put a whole lot of money into the U.S. economy, and if they either stopped contributing or completely pulled out, we'd be in a heap of trouble.  Fortunately, it looks like the Fannie Mae/Freddie Mac issues haven't scared Korea away just yet. William Sim reports, "The Bank of Korea said in a statement today it sees no problem in recovering its principal investments in senior bonds issued by Fannie and Freddie.  There is 'no chance' the U.S. government ...