Retailers, Banks Lower Stocks  NEW YORK (Reuters) - Stocks fell on Tuesday as giant  retailer Wal-Mart Stores Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=WMT.N target=/stocks/quickinfo/fullquote"&gt;WMT.N&lt;/A&gt; declined on disappointing  quarterly sales while news of a sharp rise in October producer  prices fanned inflation fears.