It's the basic question when investing in a stock: is it on the way up or will it go down? To answer this question,  Wall Street has developed numerous ways of attempting to predict what will happen, estimating various attributes tied to stock performance in order to determine what the future holds for a company's valuation. After dissecting the data, analysts following a particular stock produce a price target of where they believe the  stock is headed. Out of the entire S&P 500, which stocks are analysts expecting to have the biggest price drops?  Here's the top 20, according to ThomsonReuters (as of market close on 10/16/09). Click ahead to find out!

Unemployment hit 8.9 percent in April and some predict that number could climb to over 10 percent in 2009 as major companies streamline operations to combat the recession.  But how far can this streamlining really go? For many companies, revenues hinge on worker productivity, and for most operations, per-worker profits and revenues are many multiples of average employee salaries. The measure of revenue per employee also helps shed light on a firm's money-making efficiency and likelihood it will retain jobs. The best companies require  the least number of workers to make the most money.