J.P. Morgan Chase Profit Falls 13 Percent  NEW YORK (Reuters) - J.P. Morgan Chase   Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=JPM.N target=/stocks/quickinfo/fullquote"&gt;JPM.N&lt;/A&gt; posted  lower third-quarter earnings on Wednesday, missing analyst  expectations, as costs from its July merger with Bank One Corp.  and anemic fixed-income trading revenue hurt profits.