Part I of this series reviewed our stimulus driven, real estate-reliant, post-bubble economy. Part II looked at the cycles of bull and bear markets, and how history suggests trouble ahead for U.S. stocks -- despite the strong start to 2006. Today we focus on how it could all come together or, as the case may be, come apart. I'll detail how to get to my 2006 target of Dow 6800 -- the lowest (by far) in the Business Week survey -- and lay out a scenario for how the S&P 500 could take a 30% haircut this year. Before the...