CHICAGO (Reuters) - Wal-Mart Stores Inc is accelerating its investment in e-commerce in a bid to narrow the gap with Amazon.com Inc and to give it an even more dominant position against the rest of the field in retail.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=dYEy3nzQmWQ:nH9juPiRiyI:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=dYEy3nzQmWQ:nH9juPiRiyI:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=dYEy3nzQmWQ:nH9juPiRiyI:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=dYEy3nzQmWQ:nH9juPiRiyI:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=dYEy3nzQmWQ:nH9juPiRiyI:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/dYEy3nzQmWQ" height="1" width="1" alt="" />