AP - TARNISHED METAL: Copper prices fell 3.6 percent as concerns mounted about the pace of the global economy. Investors are worried that high oil and gasoline prices could hurt the economy by raising transportation and manufacturing costs. That, in turn, could weaken demand for copper.<p><strong>Read more:</strong> <a class="rssreadon" rel="external" title="Summary Box: Copper falls on fears about economy   (AP)" href="http://us.rd.yahoo.com/dailynews/rss/business/*http%3A//news.yahoo.com/s/ap/20110307/ap_on_bi_ge/us_commodities_review_summary_box" target="_blank">http://us.rd.yahoo.com/dailynews/rss/business/*http%3A//news.yahoo.com/s/ap/20110307/ap_on_bi_ge/us_commodities_review_summary_box</a></p>