Walmart Inc. has decided to sell its Japanese supermarket unit Seiyu GK amid fierce competition from online retailers, sources close to the matter said Thursday.The U.S. retail giant is in talks about a deal with some Japanese retailers and some investment funds, the sources said, adding that the sale price for Seiyu is set for 300 billion to 500 billion yen ($4.45 billion)Its decision to withdraw from the Japanese market comes at a time when it is shifting its investment to digital retailing in the face of competition from major e-commerce operators such as Amazon.com Inc.Limited growth po…READ FULL ARTICLE