While we have recently seen various fundamentally driven predictions for the S&P going back to its 1994 level of ~400 (most recently from Albert Edwards and Russell Napier), few charts predict a comparable major retracement in the key equity index. And while it is not quite a variant of the Kondratieff Wave chart familiar to most, this chart courtesy of Sean Corrigan shows the historical 33 year peak to trough frequency of the S&P, emphasizing the cyclical periodicity observed in market cycles. The chart predicts the next 33 year low to occur some time in late 2015, taking the S&P to the proverbial 400 level. As Corrigan observes: "A third, post-94 Bubble-era decline of -50% would unwind all of that move and half the log rise of the Great Bull Market (something the '49-'68 move did) and return to both the mid-1960's highs and Fib retrace the whole post - WWII move. Doing this by late 2015 would preserve the 33 year span."
And some other just as illustrative (and cautionary) charts: